A leak-proof, box-like, open-top, double-wall corrugated plastic floating container support with a means of retaining at least 4 hingededly-mated triangular shape corner flaps 46 exteriorly positioned to said container's cavity area 36 which retain and cooperatingly support said container's structure and shape, while also supporting said structure in a plurality of supporting roles comprising gusset-like corner support properties, carrying handle-like support properties, and aerodynamic rudder-like support properties. Its multiplicity of uses may be best described as a floating container support for human users and/or their objects, and whether upon land or water. Its construction may be made without a single completely through-cut or aperture made in its initial rectangular and planar 40 shape of corrugated plastic sheeting, and with only a nominal amount of weakened hinge line folds 50,52, and with as few as 2 locations of retension 74 required, and within specific alternative embodiments, without a need for any foreign material substrate or fastening material other than its own material, and with no need for any physical change of transforming alterations, other than a vertically directional inverting of said floating container support's position.