I've pushed on them pretty hard. I ran one like that for the 100 I did, also used it like that in bikepacking bags.
The framebag one I've got definitely doesn't stay closed without the hard plastic bit but the Platypus one I tested might. It's more ziplock whereas the Hydrapak kinda folds over and is held shut like a roll-top bag.
Platypus big zip
@hippy started
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I've pushed on them pretty hard. I ran one like that for the 100 I did, also used it like that in bikepacking bags.