FlorashleyTim,
I also use Gerber milk bag. I pump milk with Avent ISIS into a 9 oz bottle then pour the milk into the bag and keep in the company's fridge (I put the bag in a non-transparent box so that no one can see).
Gerber from Nursing Asso sell at $40 with 25 pieces. I dont trust the old avent bag as it leaked, so I m loyal to the gerber bag and i keep them in the freezer too.