Concerning your freeride passion, you put an especially high emphasis on flexibility? Are you a rather spontaneous kind of person who wants to be equipped for whatever may happen? Luckily, there are the so-called zip-ons. They are available in various volumes for longer tours with more equipment, or also for shorter adventures without a lot of hoopla. By simply attaching the zip-on to the Base Unit, you´ll be equipped for whatever!