ACS: flexible, classic back system with mesh back panel creating a space between the back and the pack for effective ventilation and specially shaped, ergonomic shoulder straps Large main compartment with dual access (from front and top), inner pocket (doubles as stow pouch for water bladder), elasticated mesh front pocket, two mesh side pockets, two waist belt pockets (one of which folds out as a bottle holster), internal lid compartment, key clip FUTURE DYE AIR MESH: breathable mesh fabric with cushioning properties and waterless dyeing technology (back system) & steel (frame). adjustable sternum strap with SOS whistle & side compression straps Measurements: 62 x 28 x 29 cm / Backlength: M - L (50-58 cm) Product Code: 2009541