As you are going to change your baby around 5,000 times, you will be happy with anything that will help you go to the bin less often. Sangenic Twist & Click is the only layer removal system that wraps each layer individually in an antibacterial multilayer film to trap odors and germs. Each refill cartridge contains enough antibacterial film to wrap all layers up to a month, depending on the size and number of layers you use. Twist & Click refill cartridges are only suitable for use in Twist & Click and Sangenic Tec (MK4) containers. The two containers rotate and enclose the layers. These refill cassettes do not match in the Simple Sangenic container.