How to store milk?

Arti

How should I store pumped breast milk? For example, if at one go, I pumped only 40 ml milk. Then after an hour when I pumped again, I got 30-40 ml milk. Now can I store both these quantity in one packet ? Or if I store them in different package, then can I mix it and give it to my LO later? Because, my LO usually drinks 110 to 130 ml if hungry else 70 ml.