Holds up to 5 days' worth, so you can change diapers frequently. *Based on using 6 L-size pants-type diapers per day. Effectively blocks odors with "3-layer biomass film" derived from sugarcane and a "twist-and-seal structure." Easy one-handed operation, giving peace of mind to first-time moms! [Compatible Cassettes] Poitech Series Shared Spare Cassette W Odor Prevention / Poitech Series Shared Spare Cassette *Please note that Poitech x Nioi Kururun Poi Shared Spare Cassettes cannot be used. I bought this because I was concerned about diaper odors, and I'm satisfied with how it works! I no longer notice the smell even when it's in the room ^ ^ *The cassettes are not new, but I'm including two that have been slightly used. Having the cassettes means you can use the Poitech right away! Please let me know if you don't need the cassettes.