The world is getting to be a very fancy place.
There i was ... thinking that this thread was talking about how you knocked the bottoms off 2 Coke bottles, smoked them over a fire, and made some improvised sunglasses. HAHAHA !!!

The trouble with the store-bought glasses is that they are all very fragile. Made for ideal conditions and perfect handling. But they can't even be roughed up in a backpack.

Pete #2