Size medium. Variquick harness adjustment system lets you dial in the best fit quickly and easily Contoured, padded shoulder straps feature 3D air-mesh lining for breathability and stabilizer straps for ideal positioning of pack Bi-laminate foam hipbelt uses a soft interior foam for comfort and a stiff outer foam for weight transfer and lateral movement control Deuter Aircontact Lite suspension features a special hollow foam which creates a pump effect, forcing warm air out and drawing cool air in Hollow-core aluminum X-frame offers torsional rigidity, flexibility for body movement and effective weight transfer Top- and front-loading main compartment offers lots of room for your overnight gear; 2 side mesh pockets store your water bottles and snacks Adjustable lid has 2 pockets for quick access to gear such as map, headlamp, first aid kit, sunscreen and multi-tool Extendable lid allows you to expand the collar, adding up to 600 cu. in. (10 liters) of storage space Hydration-compatible design features reservoir pocket and drink tube exit port for on-the-go hydration (reservoir sold separately) Bottom compartment lets you stuff your sleeping bag or other light, bulky items directly into the pack; shares a zippered separator with the main bag Side compression straps let you cinch down loads for jostle-free carrying Dual ice axe loops and front elastic cord are ideal for securing gear to the front of the pack