The cooler itself warms up and then conducts that heat into anything touching the inside walls ... then put the ice cream in.

One of my favorite MVPs this season was a portable soft cooler: the Titan by Arctic Zone Deep Freeze 30-Can Ice Wall Backpack Cooler ... everything packed into one bag. The two side pockets ...

The Tourit 30-can Cooler ... bag during testing. While visiting a park in 90-degree weather, we found minimal ice meltage, prompting us to use it for transporting delicate frozen items like ice ...