Oh, and there's another hydration pack advantage for those of us who do hiking and backpacking. I notice that almost all the newer daypacks and backpacks have a self-healing aperture out the top to accomodate the sip-tube. I recently used the bladder in a backpack on an end-to-end Assateague Island walk.

BTW, anyone else get "Dune" stillsuit flashbacks when they take a hit off the catch-tube? I seem to channel Gurney Halleck's spirit every time and look over my shoulder for Wormsign [SUVs] and Harkonnens [ridiculously lifted pickups]. Gurney was truly bad news for bad guys. Still in love with Lady Jessica after all these years, tho' I believe my wife has mastered "the voice".