Urinary drainage bags are used to collect and store urine from the bladder. Urinary drainage bags are connected to a catheter that is inserted into the bladder and allow for continuous drainage of urine. Urinary drainage bags are commonly used by patients who are unable to urinate on their own due to medical conditions such as urinary retention, incontinence, or spinal cord injury. They are also used post-surgery or during labor and delivery to collect urine during the healing process.