Komine's SA-200 Waterproof Riding Bag 30 is wade with Welded waterproof liner and is constructed seamlessly to keep your valuables dry when you get caught riding in the wet. The 30L capacity makes it a good sized storage compartment but not too big where it becomes difficult to use as a backpack. The shoulder straps have the option of being covered up, when attached to the bike, or available when you want use it as a backpack. The waterproof bag attaches to your bike with use of your own bungy cables or tie downs and it also offers reflective qualities so you can be seen on the road. Keep your valuables dry with Komine's SA-200 30l bag that can use for many activities in life.