WXP3L 3 Liter Hydration Bladder. Eberlestock backpacks are ready to accommodate top-of-the-line hydration systems. You’ll find that they have dedicated bladder pockets, louvered tube portals, and tube clips on the harnesses. We've found what we think is the ultimate hydration bladder system. Made by Source®, their premium bladders use patented anti-bacterial technology, and Glass-like™ liner, so that you get a product that gives great tasting drinks and long life.  Features include dual fill options (wide-mouth or screw cap), weave covered insulated drink tube, and a dirt shield for the drink valve.

Please note: This bladder is recommended for all Eberlestock packs, with the following exceptions and caveats: It does not fit the X1 series of packs. It fits, snugly, in the Slingshot. It fits in the main outboard pockets of the Phantom, the Halftrack, and the B3H Stalker, but not in the narrow sleeve with the hydration hooks (the WB2L bladder fits these sleeves).