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I found these drink bags on ebay a while ago and have been testing them with the idea of using them as bladders. so to convert one into a bladder i have drilled a hole in the lid and glued in a hose fitting but you could use some brass tube. just out of curiosity, i connected it to a little geared water pump and started filling. I wanted to know when and where it would burst but surprisingly the pump stalled out and the bag is solid with no leaks. even squeezing it as hard as I could with both hands i couldn't burst it.
https://www.ebay.co.uk/itm/364223176229
you can also get much bigger version with a hose fitting already connected.
https://www.ebay.co.uk/itm/155510765063
https://www.ebay.co.uk/itm/364223176229
you can also get much bigger version with a hose fitting already connected.
https://www.ebay.co.uk/itm/155510765063
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