The world's most in-depth and scientific reviews of outdoor gear

How We Tested Coolers

By Maggie Brandenburg ⋅ Senior Review Editor
Thursday May 9, 2019

The world of coolers has come a long way from the days of plastic lined containers and styrofoam boxes. And if manufacturer claims can be believed, portable ice chests have also grown increasingly elaborate, supposedly holding ice for up to 10 days and keeping out hungry grizzly bears! With this new, improved technology and a seemingly endless train of products parading through the online marketplace, it can be overwhelming to figure out which one will give you the performance you need and at a price you're willing to pay. We've spent thousands of hours over the past several years continually researching and extensively testing the top models available. Rather than create unrealistic conditions to make these test pieces sound as good as a mini fridge, we subjected them to a battery of real-life tests to see how they actually compare. Here's how we did it.

Stacking up to the competition.
Stacking up to the competition.

Insulation


Without question, insulation is the most important aspect of any traditional cooler. After all, if you didn't need something to keep your food and/or beverages cold you'd just stuff them in a bag or regular box and save the cooler cash. The insulatory value is in fact so important to a cooler's value that this metric alone makes up half of each cooler's overall score.

Insulation also seems to be a manufacturer's favorite statistic to make claims about. Coolers come with all kinds of ice-holding guarantees, from 5 days to 10 or more! When you read the fine print of these claims, you immediately discover that the tests were run under what we think are some pretty unrealistic, and unstandardized, conditions. These include prechilling the entire cooler, sacrificing a 20 lb bag of ice 24 hours to really prep the cooler before you load it, using a 2:1 ice:food and drink ratio, always keeping it in the shade (and never in a hot car), never draining melted ice water, and only opening the cooler a few times a day when it's not as hot outside. Yeah right.

The Pelican Wheeled 80  loaded and ready for insulation testing.
The Pelican Wheeled 80, loaded and ready for insulation testing.

With claims so specific and restrictive, we didn't even bother testing them. Instead, we treated these coolers like we think most people planning for a weekend camping trip after work on Friday or morning prepping for a Sunday afternoon barbeque. We grabbed some standard sized bags of ice from the grocery store and filled each cooler up about a third with ice, then tossed in a whole bunch of canned beverages we bought along with the ice. Some cans, like the beer we chose, was from the cooler section of the grocery store while some, such as sodas and sparkling water, we just grabbed off the shelves. Alongside our selection of refreshments, we added our signature "iButton sandwich" — literally a temperature recording device stuck between two slices of bread and sealed in a container just like an actual sandwich. Though we realize that all the coolers would have benefitted from prechilled contents and even more ice, we think that this odd assortment is more indicative of how they're actually used by the imperfect adventurer.

To ensure the coolers were tested in realistically hot conditions, we created our own indoor controlled summer room using space heaters and fans to circulate the muggy air. The temperature of the room then cycled through hot and slightly less hot conditions each day, just as our planet does every time the sun rises and sets. We didn't open or drain these coolers at all during our testing, and though we realize you clearly would be opening if not draining them when you use them, this helped us to maintain a consistently high temperature in the testing area.

Lunch is served! Just kidding  these are our official iButton sandwiches used to measure internal cooler temperatures during testing.
Lunch is served! Just kidding, these are our official iButton sandwiches used to measure internal cooler temperatures during testing.

After ten days, we cracked the seals and snagged testing data from our scientific sandwiches. We paid attention to two important temperature thresholds: 40º F and 50º F. 40 degrees Fahrenheit is the maximum acceptable temperature recommended by the USDA to ensure raw foods - especially raw meats - are safe for human consumption. So if you're looking to take some steaks to the picnic, have eggs for breakfast all weekend of camping, or bring burgers for the whole gang on day two, this is the important threshold. Any higher than 40º F and harmful bacteria can readily grow in your food. Yuck.

We chose 50 degrees Fahrenheit as an indicator of your average level of beverage refreshment. Depending on what your choice of drink is, you may enjoy it slightly warmer (like wine) or slightly colder (lighter beers) than 50º. As different types of beers have different recommended serving temperatures, we used 50º as an average. Knowing how long you can expect to still have chilled refreshments before they just become hot drinks can make all the difference during your camping trip, family reunion, or backyard party.

The melted aftermath of our insulation testing.
The melted aftermath of our insulation testing.

Durability


A shocking number of the coolers we tested are certified by the Interagency Grizzly Bear Committee, and the internet seems to be full of videos of these plastic boxes standing up to bears, dynamite, enormous strongmen, and being thrown off cliffs. In place of having our own wildlife menagerie/pyrotechnics experts/world class bodybuilder/cliff, we tested durability with regular humans in other, more realistic ways. We inspected every nook, cranny, and crevice of these coolers, pushing on hinges, yanking on handles, sitting and standing on lids, pulling on plugs, and picking at gaskets. We dragged them around when they were full and heavy, used them as step stools whenever they were handy, and packed them to the brim with social refreshments.

We also filled these coolers with water and sloshed them around wildly to assess the effectiveness of the lid seal. We opened and closed drain plugs repeatedly to see which ones leak or are too easy to lose for the distracted user. And we left all the coolers to sit in the direct sunlight for several hours to see what would happen to them if they were forgotten during the big game or an afternoon nap. Additionally, we scoured the internet for other user complaints and compared and tested the components in question.

Spoiler alert: none of the wheeled coolers we tested are airtight. From left to right  the Rovr RollR  Igloo Trailmate Marine  Pelican Wheeled 80.
Spoiler alert: none of the wheeled coolers we tested are airtight. From left to right, the Rovr RollR, Igloo Trailmate Marine, Pelican Wheeled 80.

Ease of Use


A cooler's ease of use goes a long way toward your overall experience with it. To assess usability, we tested a number of features of each cooler, starting with the lid and latches. We tested how easily each model is opened - can you unlatch it with one hand? Can your six-year-old open it? We also tested how easy each cooler is to load and unload, as some have lids that snap closed on your hand like a hungry hungry hippo, while others are oddly shaped inside and require specialized packing skills. We also considered the capacity of each cooler and how its size and shape plays into the user experience. Some models are gigantic inside and out, while others have handles that tuck away neatly, creating a relatively small package, yet are larger within than we expected. Other coolers are long and low, facilitating an easy grab of exactly the ingredient or beverage you're looking for, while others are tall and narrow, which forces you to root around inside to find your preferred flavor of refreshment.

Additionally, we tested the external components of each cooler to see how easy those are to use. We opened and closed drain plugs and checked how easily emptied each cooler is (without simply opening the lid and flipping the whole thing upside down). Some models have larger drains that quickly and easily empty liquid contents, while others have smaller drains or drains that are located too far above the floor of the cooler, forcing you to hold one end up to adequately drain the melted icebox. We also considered the usability of handles - are they easily grabbed and/or moved into carrying position or stowed away? And for coolers with wheels, we checked how those wheels packed away into a car and how the wheel wells inside affect the cooler's packability.

The OtterBox wins points for being one of the easiest latches to use among models we tested.
The OtterBox wins points for being one of the easiest latches to use among models we tested.

Portability


Clearly larger, heavier coolers are going to be more difficult to cart around, especially when full. However, a lot of other factors go into each model's relative portability score. Of course, coolers on wheels have the obvious leg up in this competition, though not all wheels are created equal. Among wheeled models, we rolled them not just across flat, paved parking lots and sidewalks, but across lawns, through loose sand, and over bumpy gravel while fully loaded with snacks, drinks, and ice. We evaluated not only how well their wheels and clearance handled each variable surface but also how frequently they rammed into the backs of our heels or felt harder than normal to control.

For unwheeled models, portability largely comes down to weight and handle comfort. We tossed these coolers into the backs of vehicles, put them high on storage shelves in the garage, and carried them from our cars to wherever we were hanging out. During all of this, we carefully evaluated each cooler's handle placement vs. weight load, the comfort of each handle, and how easy (or impossible) it was for a single person to carry each cooler. We also considered how easily each cooler was lifted up into a car or onto a park bench. Though we didn't do an official count of the curse words used during this process, we did take note of each model's relative ease of movement - or otherwise.

Where will you take your cooler?
Where will you take your cooler?

Features


Though this metric is the lowest weighted one in our scoring, having handy features included with your cooler can make a difference to your overall experience, so we made sure to note and test each one. We didn't consider the presence of wheels or drains as a part of any cooler's features, as those are pretty heavily rolled into the Portability and Ease of Use scores. Instead, we focused on the frills and their usefulness. We awarded higher marks to more useful features such as the ability to hold dry ice (thereby significantly extending the shelf life of your food), internal baskets, and drain plug leashes to stop that important cap from escaping into the wilderness while your back is turned. Features that received lesser scores but that we still appreciate include things such as cup holders, bottle openers, and fish measurement tools.

The Igloo Trailmate Marine is the most feature-filled cooler we tested  though not all of them were our favorite features.
The Igloo Trailmate Marine is the most feature-filled cooler we tested, though not all of them were our favorite features.