Altura: OUR LARGEST SEATPACK IS FULLY WATERPROOF AND WITH A CAPACITY OF UP TO 17 LITRES Helping you stay aero and efficient on your next bike packing trip. The outstanding Altura Vortex Waterproof Large Cycling Seat pack holds all your essentials with its generous 17L capacity while keeping them protected from the elements thanks to its fully waterproof and lightweight design with a durable welded seam construction. Complete with the Hook & Loop mounting system that ensures reliable secure fastening to the saddle rails. The clever roll closure ensures the pack can be effectively used for lighter loads. While compression straps help achieve a streamlined mounting that will not impede your speed. Complete with reflective details so you can be spotted in low light.Please note the roll closure must be rolled 3 times to ensure a waterproof closure. Whilst the waterproof fabric and welded seams provide protection from the elements, this product is not submersible and should not be left sitting in water. We recommend valuables or electronics should be secured in a dry bag inside the main body of the bag for extra security. FEATURESWaterproof designRoll closureHook & Loop mounting systemElasticated cord systemReflective detailsUp to 17L capacityCOMPOSITION100% Polyamide with TPU coating