When it comes to pumping and storing breast milk, Medela has you covered with their Pump and Save Breast Milk Bags. These 50 count 5oz bags have a convenient no-spill, no-leak, easy-to-close zipper top design that is perfect for pumping directly into. The protective oxygen barrier keeps your milk fresh in the fridge or freezer. The bags are compatible with most Medela breast pumps (Sonata breast pump excluded) and come with 2 adapters - one to connect directly to your breast shield and one easy connect adapter.