like rob said, i have a 20mm box in the bed (looking for another one for the other corner). with careful packing, i can fit a jackstand, quart of oil, gallon of antifreeze, spare ujoint with u bolts, socket set, couple screwdrivers, adjustable wrench, and a hammer. i stuff a towel over everything to keep the rattling down and to provide something to wipe my hands off with.