I've tried using a glass water bottle before and it broke. Really wanted to give it another try because water tastes so much better from glass then plastic or stainless steel water bottles. When I saw this I couldn't stop thinking about it and finally bought it. Very glad I did! Glass is light but thick and sturdy. The thin rubber sleeve helps protect the bottom, and from condensation, and adds grip. Love the bamboo lid as well, has a hard plastic interior with rubber seal. Easily threaded lid which I wanted for use while driving. Hope to buy several more, would make great gifts. Highly recommend!