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Cool bag how does it work

The original ice chest was made out of galvanized metal. Later versions were made from hard plastic. They were double-walled with a layer of dense Styrofoam in between which helped to keep the contents cool. Today's ice chests are still made this same basic way. Styrofoam was a suitable insulator, but it had to be relatively thick to maintain internal temperatures for an extended period of time.

And, of course, Styrofoam is easily dented and broken, so it had to be encapsulated in a hard shell to prevent breakage. As such, ice chests have to be rigid. By contrast, cooler bags are not rigid. Instead, they are usually made from heavy but flexible fabrics, like polyester, on the outside. The inside is lined with heavy duty foil. In between the outer and inner layers are layers of materials like flexible foam, which are thin but dense and have the ability to maintain internal temperatures for several hours.

It comes in a tote bag style, which makes it a bit more difficult to search around for smaller items, but it works well for wine bottles or large water bottles. Tourit Backpack Cooler is a great backpack cooler. You can do a few things to keep your bag cooler for longer and keep ice from melting :.

This is partly down to the bag you choose. Some thermal bags are designed to be used with ice packs, as they may not be able to stop large quantities of melted ice from leaking.

Both ice packs and regular ice have their merits. Regular ice has the advantage of being smaller, so you can pack it tightly in small spaces between items in your bag. You can also pre-chill the food containers the night before, which can keep things nice and cold. We hope this has helped to answer the question of how long thermal bags can keep food cold. Also, if you have any tips on making ice last for longer in a thermal bag, let us know in the comments section below!

Miller, T. Freedman, L. United States Department of Agriculture. Klahre, A. Alfaro, D. Lunch Boxes and Lunch Bag Safety. Klemm, S. Keeping Your Lunch Safe. Chemical Safety Facts. McCauley, T. Business Wire. Lou, L. Food Network. Foster, K. Hawes, J. Keane, S. Albrecht, J. Institute of Agriculture and Natural Resources. Safe Food Storage. Alyssa is a promo expert with over four years of experience in the industry.