Altura: STABLE, LIGHTWEIGHT AND WATERPROOF SEATPACK LARGE ENOUGH FOR BIKEPACKING ADVENTURES Engineered to fit around the seat post whilst providing adjustability for different seat configurations, the lightweight  Altura Vortex 2 Waterproof Cycling Seat pack is the ideal way to carry gear on the frame when bike packing or commuting. Designed to cater for individual needs by providing lash points and a light attachment slot, as well as a roll top closure to provide adjustable capacity for your essentials. It is also fully waterproof to  level IPX6 to keep the rain out.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. FEATURESFully waterproof to level IPX6Lightweight designWelded seam constructionRoll-top closure for adjustable volumeHook & loop wrap mounting systemHypalon reinforced areas and structured inner supportKross side release buckles and elasticated cord systemReflective detailCOMPOSITION100% Polyamide with TPU coating