You can never have enough storage! These Motif Duo storage containers are used to collect the milk expressed during pumping. The Motif Duo storage containers include two containers to expand your Motif Duo container collection. These containers are compatible with all Motif Duo breast pumps, and allow you to store and feed your baby conveniently with one container. Additional containers are helpful for mothers pumping away from home and ensure the convenience of pumping even when other containers are dirty.