Milk storage

Quick question for all u experienced exclusive pumpers... so this is my 1st time as an exclusive pumping mama. With my first 2 babies i was able to breastfeed and didnt need to pump much at all but my 3rd baby was born @ 34weeks gestation and had no other choice but to be an exclusive pumping mama, she is currently 2 weeks old and only eats about 1- 1.5 oz of BM. I currently have a stash of milk in the freezer and i am now pumping about 3oz each side(6oz all together) Now my question to u, should i store the 3oz in one bag, or split it? Like 1.5oz of milk in a bag or 2oz in each bag? I hope this makes sense... i feel like im just over thinking it