Abstract: In a container (1) of flexible material and including a tube-shaped blank divided into two opposite side walls (5) and two intermediate pairs of gusset walls (6) by means of gussets (2, 3), and having at least one block bottom (8, 9), a tightly sealed, outwardly folding discharge valve (11) is provided in the block bottom (8), said discharge valve being resealable and provided with a gripping means (16). The opening of the valve is formed by shortening a part of the floded end area to predominatly the same length as the depth (19) of the guesset (2).When manufacturing the container (1) from tubing, it is gusseted and divided into blanks corresponding to the container.