FreeSpan ventilated suspension with full-length suspended mesh with oversized holes for optimal airflow to keep you cool and comfortable on the trail Breathable shoulder harness with magnetic sternum buckle and hose clip for the reservoir bite valve Includes 3D Hydro quick-drying, soft-molded reservoir (3 Liter) with integrated drying hanger and Spine molded handle for easy refills Large 3/4 zippered access to dedicated hydration reservoir pocket with revolutionary SpeedClip hydration hanger system Panel-loading zippered access with interior mesh zippered pocket with key clip for secure storage Front quick-access pocket with padded soft-touch sleeve to protect devices For a do-pretty-much-everything hydration pack, we like the Gregory Sula 16 H2O Pack for our day trips. It's super comfortable with a ventilated suspension system and breathable shoulder straps to keep us cooler, plus a women-specific fit that hits us just right. The oversized hip-belt pockets fit our phones, lip balm, and energy chews, and the pack itself features several internal and external pockets to pack away our snacks, map, devices, and emergency rain shell or mid-layer. The included 3-liter water reservoir has a spine-molded handle for easy re-fills and an integrated drying hanger that fits nicely into the dedicated water sleeve pocket. It's easy to drink on the run with a magnetic sternum buckle and hose clip for the bite valve to keep it from fLolepping around on our hikes, runs, and bike rides.