An extension for a truck bed may include a main extension flap configured to overlap a top surface of the truck bed and extend rearwardly beyond a rear edge of the truck bed and a lower reinforcing flap configured for arrangement below the truck bed and extending rearwardly and upwardly to support the main extension flap, wherein the main extension flap and the lower reinforcing flap are configured to form a removable sandwich connection on the rear edge of the truck bed.