Boxit is a combination of a large transport basket with a form fitted freight container lockable inside - both components can also be used individuallyWithin seconds Boxit converts your sport bicycle into a cargo bike with a maximum capacity of 23 kg/ 50 lbsComes with the premounted heavy duty version of the Snapit adapterAvailable in two sizes *Not compatible with the narrow base of Racktime Light models or the Secureit locking systemNote: Boxit does not fit on racktime 2.0 carriersSnapItSteel/Composite17.9x7.1x12.6`Black50lbs