I was looking for a water container that was packable and would stand up to freezing. I filled this bag with water and froze it solid. No damage to the bag. After thawing there were no leaks. I did this twice with no problems. I left about an inch of airspace at the top when filling to allow for expansion just to be safe but I probably didn't need to do that. The bag has enough flexibility to accommodate freezing. Tough material. Nice volume graduations on the side. Also it has two baffles inside to reduce sloshing which is nice for backpacking. Looks like a keeper.I just purchased another one.
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