The ortlieb x tremer sack dry bag are brilliant alternatives to rigid boxes and bulky barrels both sizes a huge holding upto 130l each the ortlieb bag features a rollrsquonrsquosnap closure and strategically shaped padded and adjustable shoulder straps with chest strap enable you to carry in comfort and with a perfect fit the bag is 100 waterproof which is also suitable to use as a protective transport cover for luggage then when empty can be easily folded flat in a small pack