Topeak drybag wedge saddle bagthis topeak wedge drybag qr is ideally suited to wet and nasty conditions. Constructed from a tough, sonically welded and seam sealed waterproof material, this topeak wedge drybag qr will keep your essentials dry. An innovative quickclicktrade system allows you to mount and remove quickly.featuresmaterial 210 denier 420 denier nylon waterproof fabric with sonically welded seamsinsulation semi rigid eva foamreflective printingsafety light clipfast, easy on off and swapping between bikesbag attachment quickclicktrade f25 with seatpost strapseatpost diameter oslash25.4 oslash34.9mm capacity 0.6l s 1l m 1.5l ldimensions s 15x9x9cm 5.9x3.5x3.5 dimensions m 18.5x11.5x11cm 6.9x4.5x4.3 dimensions l 23x13x11cm 9.1x5.1x4.3 weight 140g s 170g m 235g lbuy topeak accessories from chain reaction cycles, the world's largest online bike store.