They are airtight, and they can go in the fridge and freezer. No microwave use. I put one in the pocket in back of my car seat so when I travel with my dog I have a water bowl. They fold down to about 1" tall.
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Our collapsible bowl can be used as fridge crisper, camping bowl, heat-insulated mat, pet bowl, food warmer for microwave among other uses. It is ideal for all occasions both indoors and outdoors such as family dining, picnics, camping trips, sports events, lunch, etc. When not in use, it can easily be collapsed flat for compact storage saving about 2/3 space. It saves space, so that you can easily pack it in your bag or stack it, store away in a drawer.
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I've Tested Dozens of Food Storage Containers to Handle Our Mountain of Leftovers—These Are the 7 Best