Freezer Stash - 4 oz portions?

Ruby412

Just want to be sure I'm building my stash appropriately. Is this right - formula fed babies continue to up the amount of oz they eat, but EBF babies pretty much eat the same amount and the quality of the milk changes?

So, if I'm building a stash (pumping 1 x per day for 15 min), do 4 oz portions make sense? LO is currently eating around 8-9 times per day. So, 4 oz should be plenty to cover a feed, I'd think.

Should I also be making "snack bags" of 2 oz portions? Or 1 oz?

Does anyone have a system that works well for them? I have the Medela freezer bottles (I think they fit around 2.5 oz) and Lansinoh bags.

I'm pumping for occasional bottles when out and about (1 every other day or so) and also for a weekend away we have for a wedding this summer.

TIA