Abstract: The present invention is a urine bag comprising a bag portion and a collar comprised of a single piece of plastic and having a top edge, a medial edge, two distal edges, and an inside face. A tab extends outward from each of the distal edges. The collar further comprises a lip that extends at least partially around the top edge two sets of ridges on the inside face of the collar. The ridges are positioned such that they form a closure mechanism when the collar is folded along the medial edge. The plastic collar extends into the bag portion approximately one-fifth of the length of the bag portion.