The Topeak Wedge Bag II is a great way to carry around your belongings and has the additional benefit of a rain cover (excluding the Micro size) to keep everything dry in the event of a downpour. The Wedge Bag II is made from durable 1000 Denier fabric so it's strong but still light and the bag attaches securely and easily with a high quality quick release mounting system. Key Features Positive locking rail F25 fixer allows removal/mount in a snap Expanding design (Med, Lrg) Includes rain cover (Sml, Med, Lrg) 3M reflective strip Tail light strap Micro: 12.5x8.5x9.5cm, 0.5L, 77g  Small: 16.5x10.5x11.8cm, 0.8L, 135g  Medium: 16.5x10.5x12.3cm, 0.95-1.25L, 152g  Large: 18.5x11.5x13cm, 1.25-1.65L, 183g