A drainable urine pouch includes a discharge portion that is foldable between a discharge position and a closed position. A security flap is sealed to both walls of the pouch by a through weld, to define a baffle near the discharge portion. The discharge portion includes a constriction, and a stepped profile with multiple step stages. The discharge portion has one or more bias members. A drainage adapter is releasably coupled to the discharge portion. The drainage adapter has a plug with a shoulder for abutting the constriction in the discharge portion, to locate the adapter correctly for obtaining a liquid-tight seal.
