Erectable packaging including a bottom, first and second parallel lateral walls (3, 4), and third and fourth mutually opposite lateral walls (5, 6), with the third and fourth lateral walls able to be displaced between a storage position and an erected position. The bottom and the lateral walls are made from a cruciform blank, the lateral walls including two flaps (16-19) articulated on each lateral wall. The flaps are all folded parallel to the first and second lateral walls and include slits (21) and lugs (23) that engage by being fitted together so as to limit the displacement of the third and fourth lateral walls. The bottom and the lateral walls are connected to each other in a leak proof way by a flexible membrane (20).