Before setting off on a long tour, it lets off some steam: the ORTLIEB compression pack made from ultra-light nylon fabric simply loses excess air through the valve mechanism. This creates more storage space inside and minimizes its pack size. The compression pack sack also packs the equipment waterproof and is the ideal complement to non-waterproof transport systems. It is available in three sizes. Waterproof, ultra-light compression pack sack made of nylon fabric with roll closure and valve IP64 degree of protection (6=dustproof, 4=protected against splashing water from all directions with the closure rolled up 5-6 times) For space-saving packing of clothing and sleeping bag For use in non-waterproof luggage Open compression valve before filling Wide bottom loop to hold on to for easy emptying Robust, round base Note: Roll up ultralight pack sacks at least 5-6 times. Please add 15-20 cm to the height when unzipped.