The purpose of the invention is to create a urine bag that can be easily folded in order to occupy less space prior to use and that can be easily manipulated by a patient, in particular a paraplegic patient. This is achieved using a urine collection bag (1) formed by two sheets of plastic material that are stacked and welded along the periphery (2) thereof. The collection bag (1) comprises a collection compartment (3), said inlet being in communication with the intake port (4) and delimiting the upper portion of the collection compartment (3). The intake port (4) is provided with a vertical extension (8) closed along their periphery (22) thereof and comprising a urinary c catheter (9). The bag (1) of the invention is characterised in that the in-take port (4) and the inlet (6) are offset vertically, and in that the vertical height (ho) of the bag (1) corresponds to a multiple of the height (hp) of the extension (8).
