Bag for collecting urine, leg, with a minimum capacity of 750 cc and tube 35 cm., Which incorporates an antireflux valve which ensures that the urine emitted can not return to their source and drain valve. The urine collection bags, Leg, are medical devices, used as a receptacle where urine is stored backwater and from a collector or a bladder catheter applied to the sick, not bedridden. Collection bag: Made with 2 sheets of PVC, transparent milky, high frequency welded. Check valve: At the top of the bag, it has a double flexible sheet of PVC, which prevents possible rescission of liquids or gases. Tube: Transparent PVC of 35 cm. (+1 Cm / -3 cm) in length, welded to the top of the bag high frequency, to ensure perfect adhesion. The inner lumen of the tube is 5 mm. Connector: pellet of white PVC, welded to the end of the tube and having an inner diameter of 5 mm. for attachment to or collector tube. Cap: Polyethylene low density blue, to protect the connector. Drain valve: From pellets white PVC, welded to the bottom of the bag and a free inner diameter of 6 mm outlet. Cap: Polyethylene low density, blue, slide for closing and opening the drain valve.