This video shows you how to pack and freeze breast milk as well has how to organize your freezer stash to optimize space.
At the end of the day any extra milk I have left in the fridge I measure out into 5 oz servings and freeze.
Make sure when freezing breast milk you get out as much air as possible to avoid freezer burnt breastmilk.
The following products are what I use.
NUK Seal N Go Breast Milk Bags, 100 Count https://www.amazon.com/dp/B00AWLZDYU/ref=cm_sw_r_cp_apa_O2McAbX8H7SM3
Medela Breastmilk Collection Storage Feeding Bottle with Lids – 16 Pack (16 Bottles and 16 Lids) [8oz / 250ml] https://www.amazon.com/dp/B01CIU5DHY/ref=cm_sw_r_cp_apap_2qnGn9Z6zLCqL
Parent’s Choice Bottles, 3-Pack, 9oz, Slow Flow, For 0+ Months Orange and Blue https://www.amazon.com/dp/B00VPKFYGE/ref=cm_sw_r_cp_apa_K5McAbSM1YWJP