try doing it in small portions so milk won't go to waste. I do 5oz the most and is easier to thaw out. .

I go 4 for my donor mom. she said they like never do more than 4ozs a feeding

My bags hold 6 oz but I only fill it to 5 oz because the milk expands when it freezes, so if I fill my bag to 6 oz it busts open and comes out of the top.