Dome-topped metal trash cans are used to collect waste and have a push-open door to hide contents and contain odors. The dome-shaped top prevents people from placing trash on top of the receptacle. Metal cans are pest- and rust-resistant, and won't absorb odors or crack.,Metal trash cans are used indoors and outdoors to collect waste in office buildings, parking garages, walkways, and other high-traffic areas. Metal does not absorb odors and will not warp when used in hot or sunny locations or crack in cold weather. Metal also won't be chewed by pests or rodents, which can happen with plastic trash cans.