Abstract: An improved portable storage container comprises an exterior support frame (1) defining an interior space having an upper periphery and including upright members (3) spaced around the periphery of the interior space and horizontal elongate members (6) disposed about the upper periphery of the interior space, the elongate members (6) each extending along a corresponding side of a polygon. A flexible vessel (2) is arranged within the interior space. The container comprises elastic support means for the upper perimetral portion of the perimetral wall (8) comprising a plurality of strips (10) of elastic material, each extending over a corresponding elongate member (6) of the supporting frame (1), a first end portion (11) of each strip (10) being bonded in a first region of bonding to an inner face of the perimetral wall (8), and a second end portion (12) being bonded in a second region of bonding to an outer face of perimetral wall (8).