Aero shaped wedge pack with easy-to-use quick release mounting system. Large openings swallow up all the things you take with you. Gussets hold the rear flap in place when open. Hard wearing fabric. Features: Expanding design on M & L models for extra capacity Built-in pump holder on M & L models Tail light strap included 1000 Denier Teflon coated fabric 3M Scotchlite reflective safety strip