Mountainsmith day lumbar pack - 13 liters Interchangeable and detachable shoulder straps and over shoulder strap. Both included. Hydration compatible Compact lumbar pack that keeps you organized and cool Durable nylon outer ripstop handles daily wear and tear with ease Freeflow EVA back panel limits sweat build-up and centers the load 13L size is ideal for involved day hikes or bike rides Multiple stash and interior pockets keep you organized and prepared Side-reinforced bottle pockets keep your hydration nearby Adjustable waistbelt locks in a secure and reliable fit Compression straps on bottom