The moab jam rucksack from jack wolfskin also comes in this 30 litre option which is a tough and durable rucksack that has plenty of storage space and an incredibly comfortable full contact suspension system and adjustable hip and sternum straps making it ideal for demanding activities such as cycling hiking and of course everyday use too the suspension system on the moab jam rucksack combines a snug fit with generous freedom of movement the central ventilation channel and the air permeable back