I have two Haakaa pumps that I use often to collect my breastmilk. I typically tandem feed my twins, so I rarely wear one while I am breastfeeding. I wear the Haakaas after I breastfeed my babies to keep stimulating my body to create more milk.
I store my breastmilk in 4oz Mason jars in the fridge and freezer. I love the 4oz size because they easily stack on each other, and they do not take up a lot of space in the fridge.