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How much crap can you stuff in with the water? i don't tend to carry much, thinking if i could fit a gf1 in for longer more scenic rides? and no i don't want to carry some expedition pack with enough room for a kitchen sink.
they're pretty tight for space, essentials only really.
I carry a midsized pump, a long battery stick for the headtorch, and that's about full, can just about squeeze in some some spare gloves.
Not seen a GF1 in the flesh so not sure about size, but I've just tried squeezing in an old Powershot and it's too tight for comfort, even without case and with half empty bladder.
I'd try before buying, but personally think it'll be too small.
having just had a look at one in the local shop, i am surprised they bother with any zips, you can carry amost nothing as far as i can see. back to the drawing board. Might wait till the Octane LR comes out and see if that is any better.