I have a very "non-stylish" pair of glasses which always travels in my personal kit with me that are perfect for these types of situations. Since gas masks and protective masks are not EFF (Elmer Fudd Friendly), I bought a special pair of glasses which would not compromise the seal between my face and a protective mask. Consists of folding black plastic frames, but instead of the earpieces it has a wraparound flat rubber headstrap. Stays on securely, and it passes the mask test. An added bonus - I can wear them while swimming underwater and still see!! Lightweight, tough, and doesn't occupy much space in a kit.