The ortlieb pd350 dry bag is a sturdy reliable dry bag with a waterproof roll top closure including a stiffener bar which also helps compression your packing a variety of colours and sizes are available to help you organise your packing and suit your requirementsall the bags feature two d rings to help with secure the bags in transit plus a bottom loop for fixing and holding during unloading52cm high70cm circumference22cm diametervolume 22lweight 290gthe roll closure must be rolled at least