Since we were chatting in a previous message about using the camel-backs,
and how some triathlon riders have something bar mounted, possibly a
camel-back type tube in a frame-mounted water bottle, I've kept my eyes
open.
Just came upon this, FWIW, called a Pakteen. "This 50 oz stand-alone
hydration system will integrate with a load-bearing belt, web harness, or
can be stowed inside a ruck."
Not sure if the tube is stiff enough to project above the bars for easy
reach by bending over a little to get a sip. That would be an important
feature, but looks like it might strap to the H/B fairly easily.
http://www.google.com/search?hl=en&ie=UTF-8&q=CAMELBAK%C2%AE+PAKTEEN&btnG=Google+Search
http://shop.store.yahoo.com/safetyglassesusa/cb108.html
I just picked the yahoo link at random for a picture source.
-B