I bought these bottles to go with the
Medela Swing Electric Breastpump. They're great for storing milk in the fridge or in the freezer, and are made from polypropelene, which is free from Bisphenol-A, DEHP (phthalate) and latex, making them safe for storing precious milk. The bottles come with a screw-on cap which has a removable disc where the teat is inserted. Teats have to be bought separately, which seems quite sensible, as they are available with different flow ratings to suit your baby. It is also worth noting that a bigger lid to cover the teat is not supplied with these bottles.
The neck of the bottles is very narrow, and so they're not very easy to clean out. I've resorted to pushing a cloth in on the handle of a spoon - I'm sure a bottle brush would also work! The bottles are also dishwasher and microwave safe, which does make sterilising easy.
One three pack of these bottles, plus the bottle that was supplied with the pump, has served me very well for a year (after that, my daughter started using a cup for drinks). When I had a need to freeze larger quantities of breastmilk,
Medela Pre-Sterilised Pump & Save Breastmilk Bags worked very well.