I'm not sure I would want my water bucket hanging on back of pack, no matter how it was attached or located :-/
In my experience, the more you hang on outside of pack, the more chances you have to snag or hang-up especially if the trail is a little rough.
Snag that water bucket, or lean against rock not thinking and you wind up with a leaking water bucket.

I'd look for a small mesh zip bag with clip or loop for carabiner and clip that on bag of pack or near haul loop. I know there around, you just need to look in pack accessories. I have a kitchen gear bag that has a built in mesh sack for scrubee. IF you need a new set-up I'd get one with the mesh built in, if not I'd consider the little mesh gear sack ;)

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