A roll-off dumpster is a heavy-duty trash container used for big cleanup projects. This large, sturdy trash container is rectangular in shape and made of welded steel with an open top for easy, on-location loading of junk, trash and debris. Its large capacity makes it ideal for a cleanup, remodel, renovation or demolition. The industry name for these garbage containers is “roll off dumpster” because they are delivered by a truck that rolls the dumpster off the back of the truck.