Since its introduction over two decades ago, the CamelBak M.U.L.E. 3L Hydration Pack has been a favorite of mountain bikers and day hikers alike. At its core is a 3L Crux Reservoir that delivers free-flowing, drip-free water on demand. But, what makes this pack ideal is its perfect blend of storage capacity, fit and durability. 500 cubic inches of gear space is just right for a light rain or wind jacket plus keys, snacks, phone, wallet, etc. Five external pockets let you organize as you see fit, and a stretch-compression panel on the outside is perfect for wet-gear stowage. All of this comes in a slim design that won't impede movement or get hung up on overhanging branches. The M.U.L.E.'s Air Director back panel provides superior ventilation, and its contoured shoulder straps (also ventilated) won't bind or pinch. You also get a removable torso strap for added stability when the single-track turns rocky. Ridiculously tough Ripstop Nylon with reflective accents means this pack will be your trail companion for a long, long time. Pro tip: the M.U.L.E. also makes an excellent hydration solution for outdoor festivals - it's the #1 pack we see at ACL Fest here in Austin.