A rubber squeeze pump stored on one of the shoulder straps lets the wearer inflate a pouch inside the pack which pressurizes its water bladder. So when it comes time to drink, biting down on the release valve on the end of the drinking hose provides a torrent of refreshment. The system also makes the $140 pack useful for filling water bottles, cleaning wounds, or even cooling off on a hot day. And yes, there's no reason it can't be used as an on-the-go bidet too.
[Geigerrig via Gear Patrol]
Pump Up This Pressurized Hydration Pack So You Never Have To Suck