Instead of baby bottles containing Bisphenol A, EHANSí Guide to Less Toxic Products recommends:
The best option is tempered glass bottles with silicone nipples. Both are widely available in pharmacies and department stores. Glass bottles are easily cleaned and sterilized, and can be handed down from baby to baby.
Evenflo - tempered glass bottles, silicone nipples
Gerber - silicone nipples
Playtex - silicone nipples
Of course, the absolute best packaging for milk is the human breast.