Abstract: The invention relates to a sanitary urine collector bag which fills a niche in the current market. According to the invention, normally appropriate urination means are not required by healthy or sick persons needing to urinate frequently, especially while on the move. The invention comprises a bag which is at least partially inserted inside the body, the opening of said bag being positioned internally to allow the urine to pass from the user or patient to the bottom of the bag. The opening, having part thereof inserted inside the body, forms a non-return closing means which prevents the contents from inadvertently emptying. Additional closing means can be incorporated into the inventive bag. The internal part of the bag can be extended outwards, thereby forming a flattened tube with a secondary opening at the end thereof.