Strap Model: Aero shaped wedge pack with positive locking QR buckle and high strength straps. Large openings swallow up all the things you take with you. Gussets hold the rear flap in place when open. Hard wearing fabric. Expanding design on M & L models for extra capacity Tail light strap included 1000 Denier Teflon coated fabric 3M Scotchlite reflective safety strip Quickclip Model: 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. 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 Dimensions: Micro - 16 x 8 x 7.5 cm Small - 18 x 8.5 x 11 cm Medium - 20 x 11 x 12 cm Large - 23 x 13 x 14 cm