Container filled with a liquid concentrate for making dialysate

A self-standing bag filled with a liquid dialysate for making dialysate for a dialysis treatment, said self-standing bag made of two flexible elastomeric rectangular side wall sheets, each side wall sheet having horizontal top and bottom edges and two vertical edges, and one flexible elastomeric rectangular bottom wall sheet having two horizontal edges and two vertical edges, the bag when empty capable of a flat configuration in which the bottom wall sheet is sandwiched between the two side wall sheets, the bottom wall sheet is symmetrically single-folded parallel to the bottom wall sheet horizontal edges, and the horizontal edges of the bottom wall sheet coincide with the horizontal bottom edges of the two side wall sheets, the bag when empty and in the flat configuration thus being divided into a lateral four-layer part and a lateral two-layer part;

• said bag further including first sloped sealing lines on each side of the bag joining the side wall sheets in the lateral two-layer part between first points (A′, A″) on the horizontal top edges of the side wall sheets, that are recessed by a first distance (a) from the ends of the horizontal top edges, and second points (B′, B″) that are less or not recessed by a second distance (b) from the vertical edges of the side walls sheets and that are positioned on the line separating the lateral two-laver part from the lateral four-layer part;
• said bag still further including second sloped sealing lines joining each side wall sheet and the neighbouring bottom wall sheet in the lateral four-layer part on each side of the bag, between third points on the horizontal bottom edges, that are recessed by a third distance (c) from the ends of the horizontal bottom edges, and the second points (B′, B″).