CamelBak Mule LR Backpack-Style Hydration Pack. In excellent condition. Great for cycling, hiking, whatever. 3 liter reservoir, carried near the hips for better overall feel.
Very clean - no rips, odors, and the reservoir never had anything other than water, and I have always been meticulous about properly drying them out after use.
For those who may be sketched out about using someone else's bite valve, know that they can be had for $6-8, at online vendors or at REI or most bike shops.