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.Tail light strap included 1000 Denier Teflon coated fabric 3M Scotchlite reflective safety strip Small: 40 Cubic inches*Not suitable for Bontrager saddles