BMW Function 4 £117.49

A cavernous bag, its waterproof rolltop main compartment is concealed under a zipped flap. There are four showerproof external pockets, a rigid backboard, a removable waist belt and it even converts into a tailpack. The broad shoulder straps are comfortable, though it doesn’t quite conceal heavy loads. It’s easy to ride with, load shift being managed well — though there is some noticeable highspeed drag. Overall, it’s a very good bag.