Eagle Creek Ready Go Pack 30L Backpack Anti-Theft: Lockable, self-repairing zippers on main compartment Digital Safe-Zone: e-fleece electronics pocket Personal Safety: Reflective accents for dusk and nighttime visibility 3L hydration bladder compartment with elastic loop on shoulder strapfor securing hose, or use as a 15 laptop sleeve Contoured moisture-wicking Air Mesh shoulder straps with adjustable tuck-away waistbelt and sternum strap for a comfortable, secure fit