If not folded properly water will get in and turn sand into mud (but on the other hand it makes it heavier and works better) it was just very difficult to throw away and thankfully I didn't use it to keep my stuff dry. I bought it to hold my inflatable island. 1 wasn't good enough so I bought 3 more, 2 or 3 should be good to keep it in place and I'll be using the other 1 to keep things dry until I can figure out how you fold it properly to keep water out.
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