No matter what I did I couldn't stop them from expanding unless I taped them together and used a leash to tie them to tie together when squeezed. However, they are still a lot. Not only were I able to compress a ton of stuff for transport (with extra tape and string), but they kept our stuff clean and easy to find. If you must use them for space reasons, I recommend reinforcing the opening and air valve with tape to further prevent air ingress. I found it easiest to use a vacuum to remove the air, although the hand pump worked too, it just took longer.
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