here are the sizes:

6qt, for baby
http://www.target.com/Clear-6-qt-Sho...A6%20qt&page=1

15 qt, for up to around 400 or 500 grams
http://www.target.com/Plastic-15-qt-...15%20qt&page=1

32 qt, for up to 1500 grams or so
http://www.target.com/Sterilite-32-q...32%20qt&page=1