What's better for storing breastmilk? Storage bags or storage bottles?

bags take up less room

And I feel bags would be easier to keep organized in fifo(first in first out) I plan on getting some of those square plastic storage boxes from dollar tree and sharpieing the date pumped on the bag and organizing that way

Good ideas. I didn't even think about space. Definitely makes more sense. Thanks ladies. @marskhaos @sarahemccormick

I bought some of both. I like that if you're just pumping to store then you can pump directly in to the corresponding storage bottles for your pump. But the bags seem good too!

I loved the lansinoh brands ( did I spell that wrong ) anyway great to lay flat in the freezer and easier to defrost in hot water

And I suggest keeping the milk to smaller amounts and combine so u don't waste .. Like I would get 3oz out of each side so instead of putting 6oz in a bag I did 3 and 3 that way if I had to mix formula/bm it was easy and I also found it easy for top offs