Demanding expeditions require heavy duty equipment that can deal with the rigours of intensive use in extreme conditions the ortlieb big zip travel bag is more than up to these kinds of tasks constructed from robust extra tear resistant pd900 welded fabric with closure taken care of with the top quality waterproof tizip it can cope with whatever your trip can throw at you double that up with a cavernous capacity of 140 litre and internal compression straps to keep your kit in place the ortlie