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Best Adult Lunch Boxes

last updated Dec 06, 2018

When people think of lunch boxes, most will automatically envision elementary school kids carrying around their lunches. However, as people grow older they start to realize that lunch boxes are not only suited to the younger generation but the older as well. How many situations have you run across where it would have been convenient to have adult lunch boxes at your disposal? Even for adults, they are an incredible asset and everyone in the world should have one. It may not be used on a regular basis but on the occasions where it is needed, it is nice to have it.

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By Jordan Coleiro:

This list of Adult Lunch Boxes has been put together to show you the best researched and reviewed Adult Lunch Boxes to keep food and drink cool and ready to eat when the lunch bell rings. A Lunch Boxes to keep your eye on are the PWRXtreme Insulated. We love this addition because it is highly rated, insulated, has plenty of room, and is leak free.

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PictureProduct
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Rating
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1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
Size
94%
Insulation
89%
Portability
94%
Features
89%
Price Comparison Last Updated (13.12.18)
$22.49
2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91
Size
95%
Insulation
89%
Portability
91%
Features
89%
Price Comparison Last Updated (13.12.18)
$24.99
3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.8
Size
88%
Insulation
88%
Portability
93%
Features
90%
Price Comparison Last Updated (13.12.18)
$19.95
4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.3
Size
84%
Insulation
90%
Portability
92%
Features
91%
Price Comparison Last Updated (13.12.18)
$16.55
5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.3
Size
88%
Insulation
85%
Portability
92%
Features
88%
Price Comparison Last Updated (13.12.18)
$8.90
6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88
Size
89%
Insulation
91%
Portability
87%
Features
85%
Price Comparison Last Updated (13.12.18)
$39.99
7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.8
Size
89%
Insulation
89%
Portability
84%
Features
85%
Price Comparison Last Updated (13.12.18)
$12.99
8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.3
Size
89%
Insulation
90%
Portability
83%
Features
83%
Price Comparison Last Updated (13.12.18)
$11.99
9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.3
Size
86%
Insulation
86%
Portability
85%
Features
84%
Price Comparison Last Updated (13.12.18)
$13.49
10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.3
Size
90%
Insulation
84%
Portability
84%
Features
83%
Price Comparison Last Updated (13.12.18)
$22.99
In Depth Review Top 10
  • PWRXtreme Insulated
  • Lifewit Insulated Lunch Box
  • Everyday Supply Co. Insulated Lunch Bag
  • Mier Adult Lunch Box
  • Rubbermaid Lunchblox
  • Fit & Fresh Jaxx Fitpak
  • Fit & Fresh Women's Downtown Lunch Bag
  • Cosfash Neoprene Lunch Tote
  • Insigniax Adult Lunch Box
  • Attican Hango
Table of contents
  • Criteria Used for Evaluation
  • Other Factors to Consider
  • Frequently Asked Questions

Top Ten Adult Lunch Boxes

1. PWRXtreme Insulated

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.5
PWRXtreme Insulated
Size
94
Insulation
89
Portability
94
Features
89
best offer for today
$22.49
Pros:

Premium nylon design is tear resistant

Waterproof material keeps the content fresh

Cons:

The zippers are a little weak and bind on occasions

The undisputed king of lunch boxes is the Pwrxtreme Insulated Lunch Bag. With its impeccable design and features, it is not hard to see why.

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Storage Capabilities

The interior is very spacious and will accommodate several stacked food containers, as well as water bottles. On the outside, there is a front zipper pocket that can hold various accessories and side pockets that will hold your beverages.

Insulation

The PE foam insulation ensures that your food will stay cool (with ice included in the pack) for an adequate amount of time; while the non-toxic FDA-compliant Ethylene Vinyl Acetate prevents leaks.

Ease of Use and Transport

Not only is there a double-sewn top handle for easy transportation but also an accompanying 48” shoulder strap. This strap can easily be attached via quick-release thumb clips.

Dimensions

9.5” x 7.5” x 9.5” (W x D x H)

Other Design Features

This pack is made up of high-quality nylon which will resist against punctures, stains and accidental tears. In addition, the lunch box is waterproof.

Overall

For the money, there is not another lunch box on the market that surpasses the Pwrxtreme and its combination of simplicity, storage, and overall design.

2. Lifewit Insulated Lunch Box

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91
Lifewit Insulated Lunch Box
Size
95
Insulation
89
Portability
91
Features
89
best offer for today
$24.99
Pros:

Very roomy exterior and extra storage compartments

Aluminum lining eliminates leaking issues

Cons:

The zipper catches on the lining of the bag more often than it should

The Lifewit Lunch box is a very competent one in its own right and is more than suitable for anyone.

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Storage Capabilities

First off, this lunch box will open wide for loading and unloading. Its spacious interior can hold meals for up to three people and the included side mesh pockets and deep front pocket accommodate for other dry food and accessories.

Insulation

Made up of food-grade aluminum foil and 8mm EPE foam, the Lifewit has terrific thermal resistance.

Ease of Use and Transport

With an included shoulder strap and padded handle, there are multiple, comfortable ways to carry this pack.

Dimensions
7.87” x 7.87” x 9.84”

Other Design Features

With an exterior that is constructed from water and dirt-proof Oxford fabric, there is no need for concern about the exterior deteriorating.

Overall

About the only aspect going against the Lifewit is its lack of attention and widespread use, as opposed to other models. But, it is as terrific as any bag on the market.

3. Everyday Supply Co. Insulated Lunch Bag

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.8
Everyday Supply Co. Insulated Lunch Bag
Size
88
Insulation
88
Portability
93
Features
90
best offer for today
$19.95
Pros:

No-hassle, 30-day money back guarantee

Water, stain and leak-resistant

Cons:

The shoulder strap does not have rubber on it; which causes it to slide frequently

There is not much wrong with the Everyday Supply Co Lunch Bag and even though it is a little lower on the list, it is still excellent.

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Storage Capabilities

The interior can hold multiple Tupperware and there are pockets on the front and side to hold additional contents.

Insulation

With double insulation, this pack will keep your contents cool or warm for several hours.

Ease of Use and Transport

There is an included shoulder strap, in addition to the handle located on top.

Dimensions
10” x 7.5” x 9”

Other Design Features

Being made with nylon, this lunch box can be stored in the freezer. Plus, it is water, stain, and leak-resistant.

Overall

There is not much holding this back from pure greatness, but its small nature keeps it down a tad.

4. Mier Adult Lunch Box

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.3
Mier Adult Lunch Box
Size
84
Insulation
90
Portability
92
Features
91
best offer for today
$16.55
Pros:

Big enough to store an entire day’s worth of food

Separate upper and lower compartments

Cons:

It stains fairly easily

While the MIER lunch box is an above-average model, it is not quite up to par with other lunch boxes.

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Storage Capabilities

There are two separate sections inside to keep cold and warm contents separated. The exterior includes several pockets for additional needs.

Insulation

The PEVA-lining insulation will keep your food safe and is eco-friendly.

Ease of Use and Transport

With a two-way dual zipper, the front is easy to access. For transportation, there is a soft handle strap and a detachable shoulder strap.

Dimensions
10.2” x 7.9” x 10.2”

Other Design Features

It is a standard design that does not feature too many extra features.

Overall

While others may be fancier and more efficient, the MIER lunch box is still a great choice.

5. Rubbermaid Lunchblox

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.3
Rubbermaid Lunchblox
Size
88
Insulation
85
Portability
92
Features
88
best offer for today
$8.90
Pros:

Extra compartments for accessories and utensils

Multiple size and color options available

Cons:

The temperature control and insulation could have been more efficient

Rubbermaid is a well-known brand and it can be trusted that they will create terrific products. Their LunchBlox lunch bag is certainly no different.

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Storage Capabilities

It is perfectly sized to hold stackable LunchBlox containers (sold separately) and ice blocks. In addition, there are specific compartments for utensils, accessories, and large bottles.

Insulation

This pack is fully insulated to ensure foods stay fresh for as long as possible.

Ease of Use and Transport

The lunch box itself is very lightweight and the comfortable grip handle and shoulder strap make it even easier to transport.

Dimensions
8.75” x 5.38” x 8.88” (W x L x H)

Other Design Features

It is BPA-free and can be placed in a dishwasher or a freezer.

Overall

The Rubbermaid LunchBlox is terrific, but the insulation could have been a little better.

6. Fit & Fresh Jaxx Fitpak

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88
Fit & Fresh Jaxx Fitpak
Size
89
Insulation
91
Portability
87
Features
85
best offer for today
$39.99
Pros:

Multiple color options available

Includes extra containers, bottles and an ice pack

Cons:

No shoulder strap

While not the best, the one aspect that may steer many to the Fit & Fresh FitPak is the inclusion of several additional accessories.

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Storage Capabilities

The bag itself has enough room to hold several meals throughout the day, with interior mesh pockets for other accessories and food. But, it also comes included with six containers (four, 2-cups and two, 1-cups) an ice pack, a vitamin bottle and a Jaxx Shaker Bottle.

Insulation

Along with the large ice pack, the thick grey PEVA lining insulation will help keep contents cold throughout the day.

Ease of Use and Transport

While there is no adjustable strap, there is a durable handle located on the top.

Dimensions

Empty: 9” x 7” x 8”, Full (with included containers and bottles): 12” x 7” x 9” (L x D x H)

Other Design Features

The containers themselves are leakproof to avoid any spilling.

Overall

Cleary, the extra accessories put this over the top. But, the lunch box itself is fantastic as well.

7. Fit & Fresh Women's Downtown Lunch Bag

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.8
Fit & Fresh Women's Downtown Lunch Bag
Size
89
Insulation
89
Portability
84
Features
85
best offer for today
$12.99
Pros:

Durable, soft cotton exterior

Multiple color and design options available

Cons:

The cloth exterior starts to smell after extended use

This is the only bag on this list that is strictly for women; so, men, this will make an excellent gift.

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Storage Capabilities

A very roomy interior will hold an adequate number of foods, while the exterior pocket can hold any other accessory.

Insulation

The thick insulation will keep your meals cold and fresh, and the included slim ice pack can be used as a method of cooling.

Ease of Use and Transport

The zipper and wire frame allows for easy access, while the two-handle straps make transportation a breeze.

Dimensions
9” x 6” x 7.75” (W x D x T)

Other Design Features

A PEVA-lined interior keeps they pack easy to clean and the soft cotton exterior is very durable.

Overall

Unfortunately, the design is not for men. But, for women, this is a terrific option.

8. Cosfash Neoprene Lunch Tote

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.3
Cosfash Neoprene Lunch Tote
Size
89
Insulation
90
Portability
83
Features
83
best offer for today
$11.99
Pros:

Constructed with neoprene material to resist dampness and moisture

100 percent money back guarantee 

Cons:

Lacks storage compartments

Capping off this list is the Cosfash Neoprene lunch tote, and it sure ends the list on a high-note.

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Storage Capabilities

The Cosfash expands to fit a variety of meals and food dishes. However, it lacks the extra compartments that other lunch totes possess.

Insulation

Made up of neoprene insulating material, it efficiently resists dampness and moisture.

Ease of Use and Transport

Opening this tote is a breeze with is smooth zipper and comfort-grip rubber exterior. As far as transportation, there is a convenient hole cut out at the top that can be used as a soft-rubber handle.

Dimensions
12” x 12” x 6” (L x H x W)

Other Design Features

Made up from neoprene materials, all the contents inside the pack will remain safe; as opposed to lunch bags made from cheap plastic. It is also stain-resistant and easy to clean with a damp cloth.

Overall

If this had more storage capabilities, it would have climbed its way higher on this list. As it stands, it is an above-average lunch box that will more than suffice.

9. Insigniax Adult Lunch Box

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.3
Insigniax Adult Lunch Box
Size
86
Insulation
86
Portability
85
Features
84
best offer for today
$13.49
Pros:

Money back guarantee if you are not 100 percent satisfied with your purchase

Aluminum foil in the interior preserves the freshness of the food

Cons:

The top zipper does not glide smoothly

While this lunch box is not quite as amazing as the previous, it is utterly fantastic in its own right. Plus, its money back guarantee is a nice incentive.

Read more

Storage Capabilities

On the sides and the front of the exterior, there are pockets for you to hold your accessories. In the compartment, itself, there is plenty of room and can store various lunches.

Insulation

Insulated with aluminum foil, it not only conceals the temperature inside but ensures your food remains as fresh as possible.

Ease of Use and Transport

Equipped are two options to carry this bag, via the top handle or adjustable strap. Both are very handy and the adjustable strap can be removed.

Dimensions
8.4” x 6.3” x 9.1” (H x W x L)

Other Design Features

The exterior is constructed of highly durable 600D polyester, with 5mm PE of foam padding in the interior.

Overall

Not a bad second choice in the slightest and a perfect alternative to the first.

10. Attican Hango

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.3
Attican Hango
Size
90
Insulation
84
Portability
84
Features
83
best offer for today
$22.99
Pros:

100 satisfaction guarantee; throughout the product’s lifetime, you can alert the manufacturer of any issues and get refunded and receive a brand-new bag free of charge

Comes with two different sizes

Cons:

The smaller cooler is immensely small

Outside of its tremendous design and features, what is truly special about the Attican Hango Lunch Box is it comes with two different sizes.

Read more

Storage Capabilities

The larger version will hold full meals for the day, while the smaller model will hold extra snacks and beverages.

Insulation

With an implemented thermal insulation system, you can feel safe storing cold foods for several hours.

Ease of Use and Transport

On both bags, there is a leather handle strap for carrying.

Dimensions
Large Model: 6” x 6” x 10”, Small Model: 5” x 5” x 7.5” (L x H x W)

Other Design Features

Designed from high-density polyester 300D, the exterior is both fashionable and dependable.

Overall

Including two separate sizes is a nice touch and they both will suit most of your needs.

Criteria Used for Evaluation

Size

Simply, what good is a lunch box that does not have enough storage to satisfy your needs? Do not strain yourself too hard on that question, as there is not one. If this aspect of the lunch box is below your desires, then you should look elsewhere. This is how important proper storage is, whether a lot or a little. But, storage comes in many ways; such as in the interior and exterior.

First, ask yourself when you are planning on using your future lunch box. Is it going to strictly be for your lunch at work? Do you plan on taking it on family vacations and accommodating for multiple people? The answers to these types of questions will have direct implications for the storage you will need. Once you have got a general idea of when and where you will use it, you can start analyzing the storage.

As you noticed, most of the entries on this list included several extra pockets for additional drinks and accessories. Outside pockets can hold key essentials such as snacks, water bottles, keys, smartphones, and wallets. Interior pockets can then hold foods that you do not want to become accidentally soggy. But, the interior still must remain spacious enough for your cold food items.

The reason exterior and additional pockets can come in handy is that you do not want to mix everything you possess in the interior. Outside pockets keep your accessories and snacks within arm’s reach and also prevent them from getting too cold inside. But, inside pockets are just as important as you will want to keep your cold and warm contents separated inside.

Insulation

Storage may be the single most important criterion in the process of deciding which lunch box you want. But, do not sleep for one second on the design of the insulation because this can be just as critically important. If you never plan on packing cold or hot contents (that need to remain so), insulation will never become an issue for you. It is hard to imagine, though, that you would never want to take refrigerated items along with you on your trip.

Without proper insulation, even with ice inside, the cold air will escape and your cold food items will begin to increase in temperature. After all, on scorching hot days ice will not take long to melt and transform into water. Thankfully, when it comes to insulation, there is not one set solution that you need to look out for. Various types of lunch boxes will have different types of insulation, so there is no need to concern yourself with finding one with a specific type.

On this list, specifically, there were a plethora of insulation designs. A few, in particular, were PEVA-lining insulation, neoprene insulation, PE-foam insulation, and food-grade aluminum foil. All of them will more than suffice, but the aluminum foil design is quite ingenious. Aluminum foil, combined with some other sort of foam insulation, will both conceal the temperature and keep your foods fresh for several hours. Think about when you store away food in your refrigerator, often times you probably end up wrapping it in aluminum foil.

Portability

The entire concept around a lunch box is to give people a means to store food/drinks away for their upcoming trip or event. While it is not against the imaginary rules, they can be used in the comfort of your home, as well. But, that seems a little pointless. Around 99 percent of the time, they are going to be used to transport food from one location to another one. During this process, it is helpful when the lunch box/bag is extremely portable. Almost every single bag will come with an adequate way to achieve this, so you do not have to stress too much about this.

Typically, they will come with either a solo-handle or dual handles on the top. Usually, the grips on the handles are constructed from some sort of leather or likewise material; ensuring a comfortable grip. The one extra feature you can keep your eyes on, that not all possess, though, is the adjustable and detachable shoulder strap. In times where you have a heavy load and your hand is growing weak from carrying it around, it is convenient to be able to take the strap and carry it over your shoulder for a while. Even with a light amount of contents inside, the ability to use multiple carrying options is a huge bonus.

Now, as far as the ease of use, the major aspect you need to pay attention to is the zipper design. Even a toddler could figure out how to operate and open a lunch box, but a poor zipper can complicate matters exponentially. This is not necessarily a deal breaker, as many top models sometimes experience an issue with the zipper catching on the lining, and as long as it operates smoothly a majority of the time it should be fine. If it happens frequently, then you may want to look elsewhere.

Features

The main design features of the storage and interior insulation have already been covered in-depth, but there are still a plethora of other design choices and features that can sway your decision. For starters, how about the overall design of the lunch box? On any given trip, you can never predict what is going to happen. Contents can spill inside, debris and dirt can find their way on it, and accidental tears can happen. So, why not have a lunch box that manages to be prepared for all of it?

With bags that are leak-resistant and water-resistant, when contents spill inside (or ice starts to melt) the excess liquid will not escape the bag. However, what about the inside? This is where models with a stain-resistant material are so effective, as accidental spills will not leave unattractive stains. Then, there are the versions that are resistant to tears and dirt; which ensure the pack remains undamaged. Much like a smartphone case that claims to be shatterproof, as long as you do not intentionally attempt to puncture and tear the lunch boxes that have this design feature they will hold up against accidental instances (depending on how severe it is).

Finally, there are the models that are dishwasher and freezer safe. Reasons to why you may feel the need to store your lunch box in the freezer are entirely up to you. But, in the instances where it would lead a lending hand, it is nice to have. The benefits of being dishwasher safe, or easy to clean with a damp cloth, go without saying as eventually, you will need to give the lunch box a proper cleaning.

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Add Some Extra Chill

When packing your lunch and wanting to make sure it stays cool when it is time to eat, adding an extra frozen ice pack does the trick. The ice pack takes some time to heat up and will keep the surrounding food and drinks cold. The best way to pack an ice pack is to put it in the middle of your food or drink to make sure its chill is distributed among the food.

Other Factors to Consider

Style

The situation might present itself that you simply can’t decide on a few different models. They may be so equal in price, quality, design, and features that you feel the need to resort to flipping a coin. Well, do not fret, as there are still a few other aspects you can pay attention to that may end up swaying your final decision. All of which is not solely exclusive to lunch boxes, but are still important in their own right.

Firstly, see what kind of warranty or money-back guarantee is promised, if any. As you may have noticed, there were quite a few models on this list that offered some sort of money-back guarantee. Some with your standard 30-day money-back guarantees, while others offered a lifetime warranty if any problems arose in the future. Much like any product in the world, this is something you take a chance with. So, if you fall in love with a particular lunch box and it does not have a warranty, it should not affect your decision. Just think of this as an added bonus but not an essential commodity.

Next, perhaps some versions where the manufacturer offers several different sizes, design and color options are important to you. Even if the deciding factor is as simple as preferring the color and design of one model over the other, so be it as there is nothing wrong with that. But, maybe the size of the bag is the only aspect stalling your decision. If there are more size options available, perhaps there is another one that better suits your needs.

Finally, it is never a bad idea to prioritize brands that offer additional accessories and products. It depends on the seller, but they may offer Tupperware, water bottles or ice packs. Clearly, the most important aspect of your final decision is the overall quality of the lunch box but extra accessories never hurt!

Frequently Asked Questions

q: Will They Keep Hot Food Warm and How to Do So?
a:

Typically, lunch boxes are associated with food items that are either dry or meant to be kept cool. But, the insulation that is present in them, will also allow you to store hot meals inside of them. Just know, it will be a little harder to maintain than colder food will. To start, right before you place your meal into the lunch box, either microwave it or place it in the oven to raise the temperature. Then, wrap it with aluminum foil and then place it inside the lunch box. If you plan on leaving the contents in there for several hours, it may not be scorching hot but it should still be warm.

Of course, you also need to remember you may not be able to keep cold contents with warm ones. If you have any sort of ice inside, it will be twice as difficult to store hot foods. Your best bet is to avoid as many hot meals as possible, although if you devote your pack to it, you would be fine.

q: How Do You Clean a Lunch Box?
a:

Some lunch boxes will be perfectly washer or dishwasher-safe. But, for the ones that are not, you are going to need to hand wash them. Thankfully, this is a very easy process and you eliminate any chance of damaging the material via machine-washing. Firstly, fill your sink with warm water and add a small amount of detergent inside. If the lunch box is waterproof, which will vary from model to model, go ahead and completely submerge it in the soapy water.

Then, it is time to get your hands dirty and unleash some elbow grease. Simply scrub the interior and the exterior of the lunch box with a soft cloth. If you can’t submerge it underwater, be sure to wring the cloth out before using it so no excess water gets inside. To rinse it, wipe it off with another cloth filled with regular water. To cap it off, hand-dry it with a towel and then allow it to air-dry until it is completely dry.

Outside of being handy for instances where accidental water is spilled, a waterproof lunch box also makes cleaning them immensely easier.

q: What to Pack for a Healthy Lunch?
a:

While this question has nothing to do with the lunch boxes themselves, it is a pretty common one that gets addressed. Since you were a kid, chances are, your parents beat you how to eat and pack healthy. But, maybe they did not or you have forgotten after all these years. No matter where you plan on using a lunch box, packing a nutritious meal is always a smart choice. Here is a strong way to achieve it:

Firstly, and not surprisingly, be sure to include a various amount of fruits and vegetables. Secondly, including the main portion of the meal (probably a peanut butter and jelly sandwich or some slices of lean meat). Then, you could pack a snack of cold cheese and crackers. Lastly, be sure to pack a large container filled with ice water. Most of the lunch is entirely up to you as you can choose the types of fruits, vegetables, and meats. For a healthy meal, that does not sound too bad, does it?

q: Can You Fill them with Ice?
a:

At first glance, this seems like a rhetorical question as to how else would you keep your contents chilled? But, when you dive a little deeper, you may get an answer you were not expecting. If you plan on placing unpacked ice inside of your lunch box, you need to be aware of a few factors. One, if the bag is not waterproof or leak-proof you risk damaging the material with excess water. The insulation will adequately hold the ice, but it will not prevent it from eventually melting.

Also, if the bag is waterproof, do you really want all the food items inside floating in the water and possibly becoming soggy? So, the answer to the question, “Can you fill them with ice”, is a yes (if it the lunch box is both leakproof and waterproof. But, it is not recommended to do so. As an alternative, consider freezing a couple water bottles or placing multiple ice packs inside. This way, when the ice packs and water bottles begin to thaw, there will not be buckets of water inside.

q: How Well Will They Hold up In Scorching Temperatures?
a:

This is a question that will have varying answers as it all depends on each particular model. The more insulation that is present, the better chance the included food items will stay cold. There is nothing you can do to change that, which makes insulation immensely important. But, on scorching hot days, there are a few tips that you can follow to extend the amount of time they will stay chilled.

Be sure to open and close the bag as little as possible as each time you do so, precious cold air is escaping. In addition, make sure that you have loaded it with ice and that it is completely frozen (the ice). Lastly, if you can, ensure that you do not set it directly in the rays of the sun. If possible, place it in a shaded area as direct heat from the sun will rapidly increase the temperature. On certain days, your food may be impossible to keep cold but if you keep these tips in mind it should hold up on most days.

q: Will the Insulation Alone Keep the Food Items Cold?
a:

Insulation is kind of a funny concept in that it still needs other resources to properly perform the job it was designed for. In other words, insulation is designed to keep whatever is inside it insulated from the outside world; while not letting any air escape. But, alone, it does not work as a cooling or heating method. Thus, you still need to place either ice packs, frozen water bottles, or ice inside to keep the items chilled. All the insulation is going to do is trap the cold air inside, but it will not create the cold air.

Now, do not feel stupid if you thought that the insulation alone would keep your contents cold. But, now you do not have to fall into the trap of believing this.