Source Tactical Rider 3L Hydration Pack DUAL FUNCTION: Can be worn backpack style or quickly converted for direct armor attachment or streamlined ruck insertion. TUCK-AWAY CONTOURED: Shoulder Straps Shoulder straps are patterned for comfort and are designed to fold into a back storage pocket when not in use. ADJUSTABLE STERNUM STRAP: Adds carrying stability. Adjusts to fit a range of body types. ELASTIC STRAP RETAINERS: Secures dangling strap ends. PATENTED HIGH FLOW "NO-BITE": Storm-Valve with Dirt-Shield cover