Voted #1 by Outside Magazine as the "Market’s Best Overall Hydration Vest" The Adaptive-Fit adjustable sizing system provides a tailored, body-mapped fit for all body types, up to 3 different sizes of adjustability Adjustable sternum and side straps to dial in fit Breathable interior mesh shoulder straps and back help you stay cool Equipped with 2L hydration bladder with quick-release valve Transparent zippered pocket for quick-viewing of key essentials Back kangaroo pocket for stashing flasks, layers, and other essentials Large main zippered back storage to hold essential gear, with interior compartment to secure bladder Front pockets fit bottles and flasks up to 22oz Reflective hits for 360-degree visibility Weight w/o bladder: 8.8oz / 249g Weight with bladder: 13.2oz / 374g