OS-BASE is an 'over the seat harness' which allows OS-6, OS-12 or OS-18 ADVENTURE PACKS to be mounted as panniers. Carrying capacity from 12 to 54 Litres with centre pack mounting option. Heavy-duty Hypalon construction. Quick & easy to put on/take off. Reinforced stitching on all stress points. Aircraft grade alloy hooks. Non-slip cam buckles. 2 x OS-RACK LOOPS included. 10 YEAR GUARANTEE