Using these Direct-Pump adapters, Kiinde Twist Pouch breast milk storage pouches twist-lock onto pumps from ALL major brands, for leak-free, transfer-free pumping, directly into the pouch;Allows you to pump, store, organize, warm, and feed using the same pouch The Kiinde Twist system completely eliminates the need to transfer precious milk from bottles to bags and back again;For use with Kiinde Twist Pouches (sold separately);Includes 5 unique pairs of adapters to enable direct, leak-proof threaded attachment to pumps from all major brands. Adapters can also be used to attach nipples from most major brands directly to Twist Pouches, for gas-free feeding directly from the pouch;Direct-Pump adapters can also be used to adapt nipples from a wide range of brands to Twist Pouches - for gas-free, transfer-free feeding directly from Twist Pouches, using the nipple of your choice