Foil Thermal Sandwich Bags - 5 Pack - Reusable Insulated Bag - Keeps Snacks and Lunch Cool and Fresh - Easy Closure - Waterproof | Silver Color

I purchased these for a trip. I was carrying several items that needed to stay cool during summer weather. I placed all of the items that needed to be kept cool, plus a small round gel pack that met TSA restrictions, in a pint zip lock, and the zip lock fit perfectly in this cold bag. While I was traveling around locally, I could easily fold it and place it in my purse. As far as leaking, I gave it a 5, but not really sure, as I didn’t carry any liquids in them without the liquids being in a container. It would be great if these came in a smaller size, too.

Nice size bags and insulation

I bought these for the purpose of keeping food cold. They work really well but the top zipper seems to break fairly easily. I don't know how they work for keeping food hot but for cold, they work well. You can easily pack a chocolate protein bar and not worry about the chocolate melting. My son packs snacks in his disc golf bag and they have worked well at keeping food cold/non-melting even with the outdoor temps in the 90's.

Seems like a good idea in theory. But, the bag is hard to open. Plus, hard to keep clean and reuse, and the size. Could be slightly larger.

My high school age kids refuse to pack a lunch bag because it’s not cool. With these super slim cooler bags they bring all their food for tha day and it stays cool even when the temps are over 100.

We did a month long bicycle tour of Ireland where we did a lot of fishing along the way. Being on bicycles, we were very limited as to what we could carry. Getting the fish we caught back to camp was challenging. With these bags, we would fillet the fish, rinse it in the cool water, and then place it in the insulated bag. If we were going any distance we would find ice cubes, but for an hour or so they needed nothing and worked great. Also cleaned up easily and were reusable.

For about $2 per bag you get some pretty incredible insulation in a very lightweight bag. I am bringing one along for my next backpacking trip to keep my meals warm as they re-hydrate. I placed a cup of boiling water in a ziploc freezer bag, then placed it in this insulated bag and placed it in the refrigerator for 15 minutes. After 15 minutes the water was at 158 F which is pretty incredible insulation for sometime so lightweight. If you want even better results you can place this inside something like a Big Sky International Insulite Pouch. If I was packing a lunch and needed to keep something warm for a few hours, that is probably the route I would go. Each bag weighs approximately .5 ounces

These bags are great for keeping hot foods hot and cold foods cold for extended time periods. They are large enough to fit a decent amount of food and they do wash up easy. However, the print is hideous. The ones we received are white with green leaves all over it. But honestly the look doesn’t matter as much as the horrible zip closure! The little zipper piece will NOT stay on the bag and if it comes off, you will never get it back on. Not IF, but WHEN it comes off. Ended up having to literally cut the bag open to get the contents out. Overall I wouldn’t buy these bags again unless the zipper has some sort of stop on the ends.