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Being the skeptic that I am, I went and looked it up...
From: http://www.nalgene-outdoor.com/technical/bpaInf...
Most plastic containers are marked (usually on the bottom) with a number within a triangle with arrows commonly known as a recycling symbol. These numbers, known as the resin identification coding system, were created in 1988 to facilitate recycling programs across the country. These recycling numbers can range from #1 to #7, depending on the type of plastic. The #7 recycling label is a catchall indicator for plastics made with a resin other than those in the #1 to #6 designations, or made of more than one resin. The #7 category not only includes polycarbonate, but also includes compostable plastics made of organic material and other types of plastic that do not necessarily contain BPA (Bisphenol-A).
So, just b/c it's a 7 doesn't mean it's gonna kill you ;)
It may be worth an email to Starbucks ;)
A wide variety of plastic resins that don't fit into the previous categories are lumped into number 7. A few are even made from plants (polyactide) and are compostable. Polycarbonate is number 7, and is the hard plastic that has parents worried these days, after studies have shown it can leach potential hormone disruptors.
However, the 7 is the only guideline we, as consumers, have that a product "may" contain BPA.
That's still too much of a risk.
7 means "other" and until it's a little more clear than that, I will treat them all as potentially toxic. In this situation it's GUILTY until proven otherwise - it's the only way to stay safe.
Ideally, we should all push to get "7"s split out into 7, 8, 9, 10, etc. to accurately reflect their recyclability (since some of them actually are) and to reflect specifically BPA containing resins so they are uniquely and easily identifiable so we don't have to guess about our health....now THAT would be great!!!
I would love if you corrected this because when you search google images under "Starbucks Reusable Cup" You are the 1st to come up.