Methods of manufacture of containers, pre-containers, blanks for containers and containers for retaining fluids

A pre-container, expandable from a flat, folded configuration to an, in use, container for fluids, the pre-container comprising a first portion comprising a first side wall having at least two short ends and two long edges, a first long edge forming a left side of the pre-container and a second long edge forming a right side of the pre-container, the pre-container having an additional side wall, the additional side wall having at least two additional side wall ends and two additional side wall edges and hingedly attached along one of the edges to the first long edge of the first side wall, and sealingly secured along a second edge of the additional side wall to the second long edge of the first side wall to form a continuous ring;

• the pre-container comprising a base portion which is sealingly fixed to a short end of each side wall;
• and wherein the pre-container further comprises a left deformable region and a right deformable region which span across adjacent side walls, and
• wherein the pre-container comprises a left fold line which extends from a base portion of the pre-container to a top portion of the pre-container on the left side of the pre-container and a right fold line which extends from the base portion of the pre-container to the top portion of the pre-container on the right side of the pre-container,
• wherein the left fold line is formed by the first long edge and the right fold line is formed by the second long edge, and
• wherein the left deformable region extends across the left fold line and is located partially on one side of the left fold line and partially on the opposite side of the left fold line and wherein the right deformable region extends across the right fold line and is located partially on one side of the right fold line and partially on the opposite side of the right fold line such that when inward pressure is applied to the deformable regions the remainder of the side walls are forced outwards to create a cavity within the pre-container,
• wherein the pre-container is formable into a container having an hour glass shape, wherein when facing the first side wall the base portion and the top portion of the container are wider than a middle portion of the container, and
• wherein the left fold line extends from a base portion of the formed container to a top portion of the formed container, and wherein the right fold line extends from a base portion of the formed container to a top portion of the formed container.