Camelbak\u2019s most technical running pack, the Ultra 10 Vest was designed to endure one of the toughest trail races on earth: the Ultra Trail du Mont Blanc, a 103-mile course that has a total elevation gain of over 30,000 feet. This pack has been engineered to carry every item on the UTMB gear list: a 2 liter reservoir, room for food and extra layers, a secure zippered pocket for your smartphone and two chest pockets for additional water bottles. If it works on Mont Blanc, it can handle just about anything. For refilling on the run, color-coded straps have been added so you\u2019ll instantly know how to access your water supply, and an external-fill design that lets you refill without unpacking the bag. On hot days, fill the reservoir with ice water\u2014the mesh back panel lets it sit against your back to cool your core. Added features include overflow storage, trekking pole attachments and plenty of lash points, just in case you want to bring something we didn\u2019t think of. The custom-fit harness and dual sternum straps adjust for a close, comfortable fit, and the cargo compression lets you cinch everything down to minimize bulk. KEY PACK FEATURES: Adjustable harness with cargo pockets Expandable cargo compartment Integrated reservoir and cargo compression Stretch overflow storage Secure zippered phone pocket External fill Reflectivity Trekking pole attachment Fits 30-46 chest DESIGNED TO CARRY: Food, water bottle, ultra-light rain gear, shed layer, running pants, survival blanket, headlamp, phone, trekking poles, compass, socks, gloves, hat. ANTIDOTE RESERVOIR FEATURES: Quick Link\u2122 System, 1/4 turn - easy open/close cap, lightweight fillport, dryer arms, center baffling and low-profile design, patented Big Bite\u2122 Valve, HydroGuard\u2122 technology, PureFlow\u2122 tube, easy-to-clean wide-mouth opening PRODUCT SPECIFICATIONS: Hydration Capacity: 70 oz / 2L Total Capacity: 8L (610 cu in) + 2L Reservoir Total Weight: 1 lb 3 oz / .55 kg (pack only) Dimensions: 21 x 13 x 2 in Torso Length: 16.5 in / 42 cm Back Panel: Open mesh Harness: Adjustable with cargo pockets and dual slider\u2122 sternum strap. Fits 30\u201446 chest. Fabric: 70D reverse chain nylon w/ 230 taffeta.