The OS-Base is an "over-the-seat" harness which allows OS-6, OS-12 or OS-18 Adventure Packs (all sold separately) to be mounted as soft panniers. No heavy metal frames are required, as this system provides a super-tough, lightweight carrying solution with no permanent bodywork alterations to the bike. The modular design enables you to modify your luggage set-up to suit your ride - a one, two, or three-pack set-up - giving the flexibility for anything from a day's single track to longer moto-camping adventure trips. The set length straps make mounting a breeze and the purpose designed main body shape provides a tight, secure fit with plenty of distance from the exhaust. It takes less than a minute to mount the system to the bike and just seconds to remove it. Carrying capacity from 12 to 54 liters with center pack mounting option. Heavy-duty Hypalon construction. Quick and easy to put on / take off.