"[This review was collected as part of a promotion.] When we brought Bub home, she needed top up bottles after each breastfeed. The bottles we were using were 30mls so it was not worth using our electric sterilizer. Now that we have established breastfeeding, Bub only has a bottle once a week when her dad feeds her on the weekends, so again, it is easier to use this bag rather than our electric steriliser. This bag is super easy to use – you put your washed bottle parts in with 60mls of water and pop it in the microwave for 3 minutes. The bags come in a box of 5 and you can use each bag 20 times. There is a handy table at the back to help you keep track of how many times you have used your bag."