Abstract: Disclosed is an inflatable container suitable for use as a portable aquarium. The inflatable container has an upper open end and side walls which are easily and economically constructed from a single sheet of flexible film material. The sheet is folded upon itself into substantially two overlapping half sections with portions of each half section being sealed together to form four side panels. The remaining portions of the overlapping half sections form an inflatable tubular, flexible framework including an upper and a lower tubular rim and at least four upstanding tubular columns which surround the side panels. The tubular framework and side panels are formed with only two sealed seams joining the longitudinal and lateral edges of the film sheet, one of which extends longitudinally along the surface of the lower tubular rim and the other of which extends laterally along the surface of one of the upstanding tubular columns.