Here's a good page to read about the plastics that are good and bad.
http://abunchofgreens.blogspot.com/2008/03/good-plastic-bad-plastic.html
• Avoid using plastic in microwave. Any plastic can leach harmful chemicals when heated. Avoid to warm food even in plastic labeled as “microwave safe”. “Microwave safe” does not mean that there is no leaching of chemicals.
• Use alternatives to plastics whenever possible. Bring a glass container with you at the restaurants. Use stainless steel or glass to store your food.
• Buy food in glass containers. However, pay attention that phtalates were found in lids of glass jars.
• Use alternatives for baby bottles and bottles made for polycarbonate. Use instead glass bottles or other made from safer plastic.
• Drink the water from bottled water quickly and keep it away from heat to avoid leaching of chemicals.
• Do not reuse bottles or food containers made for single using.
• Avoid plastic cutlery and dinnerware.
• Avoid plastics that are not recyclable (3, 4, 5, 6, 7)
• Buy bio-based plastic alternatives if available.
• Get rid of all plastic from your kitchen