Tough for Glass
I bought this bottle because I wanted a glass bottle, but I really didn't want to deal with a bottle that would break easily. I was convinced when a coworker accidentally dropped hers while walking past my desk. I braced for the spray of glass shards and water, but the bottle's rubber bumpers protected it, and it was just fine.
It's obviously not indestructible, but if you want glass, and you don't want to worry about your bottle being easily breakable, this is a winner.