2.5L Patented ReTrakt™ hydration system Hydration hose includes our patented magnetic system that snaps it back into place on the shoulder strap after you drink – easy to access when you need it and out of the way when you don't 16L capacity and streamlined design Streamlined enough for a comfortable carry, but large enough to bring supplies and bulky items on a long bike ride or half-day hike A pocket for the essentials Top pocket provide easy access to essential everyday items like phone, glasses, keys A bluesign® certified product bluesign® is a strict international criteria that ensures the protection of workers, consumers, and the environment Quick-access side pockets Side pockets provide quick access to water bottle, nutrition or tools Detachable waist strap Waist strap provides extra stability to enhance mobility on the trail, but can be detached for casual simplicity when heading into town Comfortable, breathable back panel Back panel is made of air mesh for a comfortable, breathable hike or ride out on the trail Interior zipper mesh pocket Interior zipper mesh pocket provides secure storage for smaller items Trekking pole attachment Attachment loops let you store your trekking poles when not in use