A cylindrical container formed from a generally flat sheet of foamed plastic material comprising:
- (a) a three dimensional sheet of foamed plastic material having a length dimension determined by the outer circumference of the container to be formed from said sheet, a width dimension determined by the height of the container to be formed from said sheet, and a depth dimension determined by the radius of the cylindrical container to be formed from said sheet,
- (b) said depth dimension of said sheet being formed into a plurality of triangular end sectors with the sides of said sectors having a dimension equal to the radius of said cylindrical container to be formed,
- (c) said triangular sectors being formed at the width dimension of said sheet and at each side of said sheet of foamed plastic material,
- (d) said sectors being identical isosceles triangular sector forms with the legs thereof being said radius of said cylindrical container and the arcuate base being an arc of said circumference of said container to be formed,
- (e) the number of said triangular sectors being determined by the flexibility of said foamed plastic material and the total base dimension of said sectors being said length of said sheet of foamed plastic material,
- (f) said triangular sectors having a finite dimension parallel to said width dimension of said sheet at each side of said sheet,
- (g) said sides of said triangular sectors being in engagement with each other along said finite dimension to form a complete top and complete bottom for said cylindrical container when so formed,
- (h) said triangular sectors along said finite dimension including,
- a tongue extension along one side leg of said sectors,
- a cutout portion defining a groove along the opposite legs of said sectors,
- and a tongue and a groove on opposite legs of adjacent sectors adapted to mate with each other when said sectors are folded against each other to form a complete cylindrical container,
- (i) the surface of said generally flat sheet on the side thereof having said sectors being formed with a groove extending the width of said sheet at the intersection of said legs of adjacent sectors and the base thereof,
- said grooves being adapted to permit said sector legs to engage each other to form said complete top and bottom of said cylindrical container,
- (j) said generally flat sheet of plastic material containing mating formed surfaces at said length ends of said three dimensional sheet,
- said mating surfaces including a cutout portion at one end and a protruding portion at the other end, said portions adapted to mate with each other to form said generally flat sheet into said cylindrical container form,
- (k) and the outside surfaces of said sectors in said width dimension being formed with an indented portion at one end and protuding portion at the other end,
- said indented and protruding portions being adapted to mate with similarly formed portions of other similarly formed cylindrical containers when aligned end-to-end at said outside surfaces.