Why would I put something as awesome as this glass which appears to contain an upside down beer bottle into the imperfection category? Because the glass is double walled. I had a glass like this once. It was an exiting novelty, until the day I dropped an ice cube into it and it shattered. The walls were paper thin. I was all set to buy this glass if it were a normal thick glass with a shaped interior. It isn’t on sale yet. I’ll check back in later and see if I can find out more.