Sure, it's helpfull :

when I have drunk all the water from my 1.5l Platypus hydration bag, I use the corkscrew from my Leatherman Juice C4 to open two Burgundy bottles and replenish the hydration bag !!!
<img src="/images/graemlins/grin.gif" alt="" /> <img src="/images/graemlins/grin.gif" alt="" />
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Alain