Lilian, hehe, as i am using Avent breastpump, so i get Avent Via cup to store my breastmilk, the cup can attach to the breastpump, and it can be freeze and also can warm it.. so quite useful, no need to transfer to bottle, but it is a bit ex if u need to get many cups. Alternatively, u can buy Lasinoh milk bag or other brands of milk bag from overseas spree, it is cheaper than to buy from store.