The mounting system, in conjunction with compression straps, reduces the pendulum effect associated with large rear payloads, providing a comfortable ride for those long miles. Lightweight, polyethylene/nylon constructionWater resistant bag with roll-top closures keeps cargo dryWaterproof inner bag is included to keep contents completely dryAir release system ensure bag remains compactQuick release tool free mounting systemSafety light clip6L capacity / 50x16x15cm / 335g10L capacity / 60x20x18cm / 413g15L capacity / 67x28x18cm / 565g