This lockable box is light and strong ! 430 pounds sat on it without any hint of problems ! And that was empty ! Roomy spent months trying to pour water inside it ! Frustrated he made puddles on the window ledge next to it ! Drove maintenance crazy for weeks searching for the window leak that never was. Over joyed and greatly relieved when they found out ! Moving to the next floor was a single tripe breeze ! And almost no resettle time ! So loaded couldn't pick it up, but it rolled easy ! All in all it has been a wonderful experience !! Thank You !!