I bought these trays
Walmart.com: Fresh Baby - So Easy Storage Trays for Baby Food and Breast Milk: Feeding and when I open a can, I just put it in here then freeze it. After a day I put the cubes in freezer baggies. I get 24 cubes out of each can, and usually have enough left over for 2 meals. I was sick of wasting all the food that was left over after 3 days, so I got these. It works great for us, and I keep a couple different flavors in the freezer so they don't get sick of the same thing
Oh, they are bpa free too!