If you use a catheter leg bag, it’s usually recommended that you use an additional 2L drainage bag overnight to allow for a larger volume of urine. The catheter night bag does not replace your leg bag but connects to it. This is called link drainage. The same is true if you use a catheter valve. Do not remove the catheter valve overnight. Simply attach an overnight drainage bag to the catheter valve and leave the valve in the open position.
Some overnight drainage bags, like the Ugo 2L Drainage Bag, are suitable for link drainage, meaning they can be attached to your catheter valve or leg bag.
Sterile vs non-sterile overnight drainage bags
If the catheter night bag is sterile then it can be attached either directly to your catheter or to your leg bag. If the catheter night bag is non-sterile it is only suitable for attaching to your leg bag or catheter valve for link drainage. This is due to the risk of introducing infection by attaching a non-sterile bag directly to your catheter.