I won't repeat my long rant that went up onto my blog this week (lucky you all!) but simply put....every year there is either an email or newspaper/magazine article spread on the danger of something. Quite often it is disproved down the road, after damage has been done to the company.
In previous years it has been baby bottles, single use water bottles, microwave wrap, plastic bags, plastic dishes, etc.
Notice the common thing in all of this? Plastic.
People are scared of plastics. They don't quite trust them.
If one goes through Snopes and many other sites they can find links to studies and wether or not things are urban myths or not. For instance, people STILL send out emails about Dioxin being in freezer bags and microwave wrap (and no, they do not contain that!).
My biggest point in this? Those polycarbonate items are being used to EAT and DRINK out of, not to cook food or boil water in them. If you worry about the use of Lexan bottles on backpacking trips, you really need to think it out:
Do you use a butane/propane powered stove? Do you eat food full of fake dyes and flavors? Do you eat more than 2,000 mg of sodium a day? Trans fats? Do you drive a vehicle to the trail head? At home do you eat out of to-go containers? Microwave meals at work? Coffee cups? Plastic wrapped salad bags?
My point being is that even if there is a remote issue of anything with polycarbonate items, it is so low on the you-need-to-worry-list. You are exposed to actual things on a daily basis. Do you live in a city? Do you have a tightly sealed house? Do you commute daily in a car? Are your dinner dishes from China?
Your vehicle is belching out so much more in bad stuff than a lifetime of polycarbonate could hope to attain. The car in my avatar runs on biodiesel, and it still is polluting the world. The only thing not polluting is if I walked my butt to the trailhead.
As for polycarbonate? I have no fear using Lexan bottles, cups, sporks, spoons, etc. I also have no issue having my 10 year old use them. Far better to use these bottles thousands of time than toss that many water bottles into the dump!
(Disclaimer: I also use aluminum pans, Teflon sprayed pans, drink soy and eat soy, and heck, my kid? He has been consuming soy based items since 3 days after he was born. Oh yeah, and I also immunized him as well. I tend to look at the big picture.)