Tommee Tippee Twist & Click nappy disposal system individually wraps each nappy in multi-layer anti-bacterial film to lock away odours and germs. With so many nappy changes on your hands, you'll appreciate a little help to reduce the number of trips to the outside bin especially in the middle of the night. Tommee Tippee Twist & Click nappy disposal system individually wraps each nappy in multi-layer anti-bacterial film to lock away odours and germs. Each refill cassette provides enough anti-bacterial film on average to wrap up to 1 month's worth* of nappies depending on the size and number you use. *Based on the average nappy usage across the few years of nappy changing. With Newborn you will change your bub more frequently so cassette may last approx. 2 weeks however, as your bub grows, the number of nappy changes drops as well as the possibility you will get out and about more often, the cassettes will last longer. Please be aware that twisting unit more than once between nappies or emptying disposal unit more often can so affect the longevity of your refill cassette.