Aosom's enclosed bicycle cargo trailer is a multi-use cargo trailer and pulls the cart in one. It converts easily from a lightweight bicycle trailer to a convenient pull cart and is ideal for on-the-go use when you've got something to haul or just want a reason to ride your bike around instead of driving. Tackle shopping trips or outings to the beach and back again with ease. Think of it as a trunk for your bicycle . offering the same kind of usefulness and protection from the elements.