Recycle them

Donate them

If you don’t plan on using your eclipse glasses again, you can donate them to Astronomers Without Borders or Eclipse Glasses USA. These organizations ship free glasses to teachers, students and astronomy enthusiasts in countries that are about to experience an eclipse.

You can also mail your used but undamaged glasses to Eclipse Glasses USA. Full mailing instructions, including the company’s P.O. Box address, are on its website.

(Lorraine copied this information from an Internet website article.)