Osprey Men's Volt 75 Backpack Spacer mesh covered lumbar and backpanel pads offer cushioning and ventilation LightWire peripheral frame effectively transfers load to hipbelt Torso length is precisely and easily adjustable over a 5/ 13 cm range to provide an exact fit Fit-on-the-Fly hipbelt extends up to 3 / 7.5 cm on each size to provide custom fit Stow-on-the-Go trekking pole attachment