Self-assemblable container made of original medium-density or high-density fiberboard or similar ecological material, the self-assemblable container comprising the following main structural elements: - a bottom, - two longitudinal or larger sides, and - two transverse or shorter sides, wherein said main structural elements have a quadrangular shape, wherein the perimetrical faces of the structural elements of the self-assemblable container are cauterized to provide a supplementary seal against moisture penetration within the structural elements and wherein each of the main structural elements comprises, on a side adjacent to another corresponding main structural element, tensile resistant flexible tabs or receiving slots, the other corresponding main structural element on said side adjacent to the first main structural element respectively comprising slots or tensile resistant flexible tabs, the main structural elements being assembled together by the introduction of the flexible tabs into the receiving slots, wherein the main structural elements have edges and the tensile resistant flexible tabs have an outer face, and wherein the flexible tabs are selected from a group consisting of: a rigid rectangular projection and a flexible area, the flexible area delimited by two cuts, wherein the first of these cuts initiates at the outer face of the flexible tab and perpendicular thereto and then runs parallel to the second cut at a distance therefrom and a length toward the interior of the main structural element, the first cut generating a triangular or "V"-shaped hollow out with the opening of the "V" oriented towards the outer face of the flexible tab, in between the flexible area and the rigid rectangular projection, the second cut running slanted with respect to the edge of the main structural element toward the interior of the main structural element; and a flexible double tab comprised of a blunted point arrow head shaped body perpendicularly oriented towards the outside of the main structural element with respect to the edge thereof, the flexible double tab provided with cuts which are placed as a prolongation of the arrow head body and directed towards the inner portion of the main structural element, the flexible double tab further having a V" shaped or triangular hollow out with the opened area of the "V" centered on the outer face of the flexible double tab and the opposite vertex oriented inwards of the main structural element. - a bottom, - two longitudinal or larger sides, and - two transverse or shorter sides, - two longitudinal or larger sides, and - two transverse or shorter sides, a rigid rectangular projection and a flexible area, the flexible area delimited by two cuts, wherein the first of these cuts initiates at the outer face of the flexible tab and perpendicular thereto and then runs parallel to the second cut at a distance therefrom and a length toward the interior of the main structural element, the first cut generating a triangular or "V"-shaped hollow out with the opening of the "V" oriented towards the outer face of the flexible tab, in between the flexible area and the rigid rectangular projection, the second cut running slanted with respect to the edge of the main structural element toward the interior of the main structural element; and a flexible double tab comprised of a blunted point arrow head shaped body perpendicularly oriented towards the outside of the main structural element with respect to the edge thereof, the flexible double tab provided with cuts which are placed as a prolongation of the arrow head body and directed towards the inner portion of the main structural element, the flexible double tab further having a V" shaped or triangular hollow out with the opened area of the "V" centered on the outer face of the flexible double tab and the opposite vertex oriented inwards of the main structural element.