Bought this bag to protect a two inch thick, piece of foam used in twin bed. Expanded too much when stored in a 13 gal. trash can bag, however it fit perfectly in this bag purchased so that I can take foam with me on camping trips to put under air mattress (for extra padding against ground roughness and to prevent air mattress from moving. Perfect for car camping in back of my Outback as well! Allows me to roll up foam, put in this water food bag, and keep size of roll smaller! This also makes it easier to store! Love it! Bought more!