Bard Dispoz A Bag - 4 Urinary Leg Bags with Flip-Flo Valve and 1 Pair of Fabric Straps is a kit that includes four urine bags and one pair of reusable fabric straps. The strap can be worn on the thigh or the lower leg depending on personal preference. The drainage valve is a "flip flo" design which means you simply flip the lever to drain the urine bag. This urinary drainage bag is available in 19 oz and 32 oz and can be used with condom catheters as well as foley catheters. The built-in anti-reflux valve stops urine backflow. Sold by the box of 4 leg bags and 1 pair of straps or by the case of 12 boxes which would be 48 urine catheter bags and 12 pairs of straps.