I also have the fannypack type camelback and it does have the bite
nipple. I imagine you could rig yours to accept one too; they cost
$3.00 (I know cause mine popped off on trail once & I had to replace
it) Of course, remember that if the nipple pops off, all your water goes
down your lap & you have nothing to drink, so I was actually thinking of
trying to get a clamp for mine...now I'm just more careful where the tip
of the tube rests; the day it popped off we were on really rough brushy
trail & the end of it was sticking too far out and got hooked on a
branch. Call the company; they are nice to deal with.1-800-767-8725
Patty