Designed to keep odour and moisture in and preserve a controlled environment for your soiled cloth nappies between washes. Size 1 is 15.5" high/ 11" wide/ 3" deep and perfect for daily outings. Just throw it in your changing bag and transport your dirty nappies with ease! These Sacs wash up like a dream so just throw them into your washload right along with your cloth nappies, and then hang to dry. What could be easier?