The containers are bent because some a-holes lift them with fork-lifts.
Ha!! just handling them with f-lifts, that's nowt. Sitting as pax just forward of the wing (on a DC10) during an intermediate stop in Dhahran I watched them offload a pallet using one of those big 20+ tonne type f-lifts lifted it up to clear the floor, then reversed & dragged the top of the load along the bottom edge of the door and when it was just clear there was an almighty "BANG!" and the pallet folded down where the end of the fingers of the f-lift blades weren't reaching and the whole load cascaded to the floor, luckily missing the aircraft.
Gosh they then managed to find a hilo...
30 minute delay whilst door, floor etc inspected and then transited to final stop (Abu Dhabi) at (Captain's quote) "lower than normal height."
what fun