Insulated Easy Zip Lock Resealable Aluminum Sandwich Lunch Bag - Reusable Thermal Snack Bento Camping Picnic Grocery Hot & Cold Pouch (5, Small)

It's not the most durable bag to be honest, but it is very worth the price. It holds temperature of food good enough for day hiking, packs small, weighs almost nothing.And also small bag holds my 3L Platypus perfectly fitted, keeps my water cold whole day for hiking, and keeps most of condensation in the bag too.I recommend this.

These work better than just aluminum foil. We use them for our kids lunch and they do stay warm longer than foil wrap but not as long as we had hoped

I bought these in hopes of keeping my food organized in my day pack when hiking and also to keep things cool. I've been eating homemade frozen yogurt for lunches and have tried this bag twice now. Both times the yogurt was still firm. Haven't tried it in really hot weather. The warmest was upper 70's but the food was in there for a lot of hours. Very happy with it. Plus it can be folded over to save space in the pack.

Well partly my fault because I am awful with measurements. I was searching for an insulated bag that would hold A sandwich.. meaning one... this bag was WAY bigger than expected. So, when I made my daughter a grilled cheese for school and put it in this bag, I had to fold the bag a couple of times to get in her lunch box. She said that the sandwich was cold when it was time to eat. I think it may have worked better if it was smaller. However, I did use another bag to put in a small casserole and take to work and it seemed to work much better. Still not what I wanted.. so I guess the hunt is on..

Product is great for school lunches or carrying cold/ warm foods to work/ school . A great addition to any lunch box.Bought this for my grandson to carry frozen tacos to school . They worked . He was able to microwave his lunch and food stayed cold until he cooked it . Zip lock works great and is reusable . Just the right size !

I love these bags! We use them to carry ice for our water on the golf course. The bags don't leak and they keep the ice from melting like a zip bag do.

These bags got great reviews for keeping food hot. They did not keep a piece of pizza hot for three hours. They don’t work.

I don't know if these work to keep food cold but they definitely don't work to keep food warm. I packed my lunch in a tupperware sizzling hot and zipped it inside the bag. Two hours later it was cold. In fact, I did not notice any difference to when I just pack my lunch in a tupperware without any attempts to keep it warm. So my impression is that these bags not pretty much nothing to keep food warm. I by no means expected these to keep the food *hot* but I was at least hoping for a lunch that was a temperature where it is still appetizing and pleasant to eat. So if you are planning on using these to keep food warm, I recommend you look elsewhere. They might work to keep food cold, though.