They're BPA-free and can be recycled when the party's over!
Promising review: "I'm always reluctant to serve wine in plastic, and I try to avoid plastic as much as possible for environmental reasons. However, a large outdoor family event made real glass impractical, so I gave into pressure and searched for an acceptable disposable solution. After much searching and review-reading, I picked these and wasn't disappointed. The wine cups are sturdy, attractive, and don't have a plastic taste. That they be recyclable was a non-negotiable factor. If you need something disposable and recyclable, but not tacky, or if you have a pool or other venue where glass is a no-no, you'll be satisfied with these." —Helen A.
Get a set of 12 stackable stemless glasses for $11.99, 12 stemmed glasses for $19.99, and a decanter with a built-in aerator for $5.99, all from Amazon.