What Ice Chest Keeps Ice the Longest? | Lab Results Behind The Claim

Good Housekeeping’s lab comparison found the RTIC 65-Quart Hard Cooler kept ice longest, holding the most ice of any model tested after 36 hours.

No two labs measure the same thing. Good Housekeeping ran a 36-hour ice-retention comparison and put the RTIC 65-Quart on top. OutdoorGearLab tracked how long food stayed below 40°F and gave that crown to the YETI Roadie 48. Both results are real; neither settles the argument for every buyer.

Which Cooler Won Good Housekeeping’s Ice Test?

The RTIC 65-Quart Hard Cooler retained the most ice after 36 hours in Good Housekeeping’s lab comparison, and testers estimated it could have held out another one to two days. That covers one setup — one size, one loading method, one lab. The broader finding matters just as much: hard-sided coolers held ice better than soft-sided models.

There is no verified current manufacturer price for the RTIC 65-Quart and no standardized manufacturer ice-retention duration for it. Treat the lab win as a performance signal, not a spec-sheet number.

Why Does YETI Win A Different Test?

Those are different endpoints from “ice remaining after 36 hours” — one asks how much frozen water survives a fixed window, the other how long contents stay in a safe cold zone. Neither converts cleanly into the other.

OutdoorGearLab’s results for other models, to the same endpoints:

The RTIC 65 finishes fifth here after winning Good Housekeeping’s test outright. Test design, not brand, decides the winner.

What Actually Decides Ice Retention?

Sun exposure, ice quality, and the amount of ice you load are the variables YETI names as retention killers; lid discipline runs close fourth. Hard coolers beat soft ones in Good Housekeeping’s testing, so the box class is your first lever. After that: park in shade, start with dry, dense ice rather than slush, fill close to capacity, and stop opening the lid. Frequency of opening introduces warm air and speeds melt — the sources support that direction but give no quantified penalty per opening.

One loading detail trips people up: YETI publishes separate can-only and ice-only capacities for each Tundra, and those figures are not simultaneous.

For rated boxes side by side, our tested ice chest roundup lays out the models worth comparing.

How Do The YETI Tundra Sizes Compare?

The Tundra line scales capacity and weight together; these are the manufacturer’s published specs.

Every Tundra here carries a 5-year warranty and one removable dry-goods basket. YETI calls the Tundra 110 a seven-day whitewater cooler, but that is a manufacturer use claim, not a standardized retention test. Capacity, insulation thickness, and warranty are not proof of a specific number of ice days.

The Honest Verdict

On measured ice remaining, start with the RTIC 65-Quart. On sustained cold-holding for food and drinks, OutdoorGearLab’s data points to the YETI Roadie 48. Neither title travels. Ambient temperature, direct sun, starting ice temperature, the ice-to-content ratio, drainage, lid openings, and pre-chilling all move the result — and no source here provides a single universal winner across those conditions. Pick the box that fits your volume and budget, load it properly, and keep the lid shut.