Topeak drybag wedge wstrap saddle bagprotect 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 seatpost with a nylon strap system featuresnylon strapsbuckle rigid eva foam insulation clip for safety lightspecificationscapacity15l91 5ci material 210 denier and 42