Eagle Industries Recon Hydro Pack - 3 Pocket Black
This is your Camelbak's great grandfather. I've had this thing for probably 15 years. It's been on a few hikes, and a few mountainbike rides, but it's in very good shape. It's a unique size/shape, as it's fairly small, but can be stuffed so that it's "taller" than it is wide, see it stuffed in the photos.
This doesn't include in water bladder, you wouldn't want the old used Camelbak bladder I had anyways.
These have been out of production for probably a decade or more.