Locker – A term used to describe the storage space a person rents. Lockers are also referred to as units, space, store rooms, or storage units. Depending on the storage facility, lockers or storage units come in a variety of sizes from a 5×5 (closet size) to a 10×20 (single car garage) and larger. When trying to figure out what size locker or unit you may need, it is often best to call your local storage operator.