Passengers can rent a SmarteCarte Luggage cart at DEN for $7 (cash or credit card). Find the carts curbside on Levels 4, 5 and 6, throughout the main terminal and baggage claim areas. Once rented out, passengers may use the carts for as long as needed, there is no time limit. Once bags are checked-in, travelers can simply return it to any SmarteCarte location and continue on their way. SmarteCartes cannot be taken through security and must be returned before exiting the main terminal.