(Strap Mount)Protect your gear while riding in wet conditions. The DryWedge pack is made from a tough, waterproof material, which is sonically welded and seam sealed to provide the ultimate protection in nasty weather. Roll closure keeps water and mud out and contents dry. Mounts to saddle rails and seat post with a nylon strap system. Attachments Nylon Straps / Buckle Capacity 1.5 L / 91.5 ci Material 210 Denier and 420 Denier Nylon Waterproof Fabric, Sonically Welded Seams Insulation Rigid EVA Foam Added Features Safety Light ClipReflective Printing Seatpost Diameter Fits 25.4 - 34.9 mm Size (L x W x H) 23 x 11 x 13 cm9.1" x 4.3" x 5.1" Weight 245 g / 8.62 oz Art.no. TT9819B