its woodlined underneath the cover which has been painted black and fully sealed to prevent any leaks and yeah the bed is useable i got a call one day when i was at my garage from a courier company guy saying he was waiting at my house with a package for me so i went home where he handed me over a large box which contained my new intercooler so i tried to fit it in the passenger seat but struggled and then i thought DUH wait a minute youve got a pickup so i just launched it in the back lol its quite useful