Keep everything in check when taking on the next summit with Sonic by Black Diamond. ergoACTIV suspension provides an OpenAir backpanel and SwingArm shoulder straps for comfort. Zip panel access. Breathable mesh hipbelt and shoulder straps. Hipbelt features stash pockets and side stretch pockets. Front compression cord helps keep your gear secure. Retractable pole and ice axe loops. Bike light slot. Hydration compatible compartment. Materials : 210D nylon ripstop 400D nylon twill Measurements: ; Bottom Width: 10 1 2 in ; Middle Width: 12 in ; Top Width: 8 in ; Depth: 6 in ; Height: 24 1 2 in ; Strap Length: 36 in ; Strap Drop: 15 in ; Weight: 2 lbs 7 oz ; Product measurements were taken using size LG. Please note that measurements may vary by size.