4 mm LightWire peripheral frame effectively transfers the load from harness to hipbelt Atilon framesheet spreads the load across the entire back panel to the peripheral frame Mesh-covered ridged foam AirScape® back panel allows maximum ventilation while keeping the load close to the body Lightweight and breathable stowaway reverse spacer mesh harness and breathable, stowaway reverse spacer mesh hipbelt Adjustable torso fit and adjustable sternum strap with rescue whistle Padded top and side handles Large panel zip access to main compartment with lockable sliders on main compartment zipper Large front shove-it pocket and external zip toiletry pocket help you breeze through security lines Dual front compression straps keep the pack tight and stable whether you're bringing your whole kit along or slimming it down for excursions External gear attachment loops Quick access zippered laptop/tablet sleeve protects devices up to 16 in. Internal front flap zippered mesh pocket 2 internal compression straps hold contents securely Compatible with Osprey Farpoint/Fairview® daypack (not included) This item meets carry-on size restrictions for most airlines (size not to exceed 45 linear inches when adding L+W+H; this is subject to change, so check with your airline)