Breastmilk

Hi all mummies, would like to have your sharing thoughts on this breastmilk tips. Am running out of breastmilk storage bags. Shall I buy storage bags or bottles? To me, storage bags is easier to keep in freeze as they can be many as much as it can fits inside but need to spend on money quite lot. Unlike bottles, which is not much space to be kept and it saves a lot in recycling by washing. So what's the best for you when you are in my shoe? Thanks all!