Trash cans are used to collect, contain, and sort waste. They are used indoors and outdoors for general purpose collection and sorting. Plastic garbage cans resist dents and cracking, are generally lighter than metal cans, and are often used in back-of-house and office settings. Metal cans won't warp or absorb odor and are often used in building lobbies and other locations where appearance is important. Trash cans can be used with liner bags to keep cans clean and ease pickup.