cubic foot as shown in fig1 3 according to certain embodiments of this invention the front cover 16 the back cover 18 and or the filler material 24 can form an elliptical or a multi elliptical shaped dam portion 12 the dam portion 12 can be formed as any other suitable three dimensional shape depending on the need or the intended use in some embodiments of this invention the dam portion 12 comprises two sleeves 26 each disposed at one of the opposing side edges preferably but not necessarily the sleeves 26 are constructed of the same material as both the front cover 16 and the back cover 18 the sleeves 26 can be joined to the dam portion 12 using a sleeve seam 28 preferably the sleeve seam 28 is a conventional stitching or other suitable fastener for fabric alternative methods for attaching a sleeve at the sleeve seam 28 includes but is not limited to adhesive sealing heat sealing and or riveting in other embodiments the sleeve 26 can be formed of a unitary piece of fabric or sheet material with the front cover 16 and or the back cover 18 the dam portion 12 can be vertically supported with one support structure 30 or a plurality of supporting structures 30 the support structure 30 can be positioned within the sleeve 26 a portion 31 of the support structure 30 can extend beyond the end of the sleeve 26 as shown.