Abstract: An inflatable box of resilient sheet material such as rubber or vinyl, comprising a plurality of inflatable panels integrally joined along fold lines to provide a bottom wall, side walls and a top wall which may also function as an openable cover. The box may be made water-tight by providing non-inflatable folds or webs of waterproof material integrally joining each side panel to the side panels adjacent thereto along their respective adjoining edges. An air valve is provided in one of the inflatable panels to introduce air under pressure in that panel, and into the other inflatable panels through connecting passageways. The panels are inflated when they are lying flat. They are then folded along fold lines to form the box, and the panels are held in such position by side wall fasteners. A fastener may also be provided on the top cover panel to hold it in closed position.