The BAD Guys — Avoid containers with these numbers
#7 BPA (bisphenol-A): a chemical in polycarbonate plastic used in baby bottles, sports bottles, and metal can linings.
#3 PVC (polyvinyl chloride): a plastic containing phthalates, which can interfere with hormonal development. Some commercial plastic wraps (used by grocery meat departments) are made of PVC.
#6 Polystyrene: a carcinogen used in Styrofoam cups, meat trays, and clamsheel containers. Don't heat or store takeout food in its clamshell.
The GOOD Guys — Containers with these numbers are OK
#1 PET (polyethylene terephthalate): used in clear beverage bottles
#2 High-density polyethylene: used in milk jugs
#4 Low-density polyethylene: used for food storage bags and squeeze bottles
#5 Polypropylene: used in drinking straws and yogurt containers