A nice post, @husaini. Bamboo drinking glasses look fun!
I'm guessing that before actual glass-making began, people were making drinking vessels out of all sorts of things. Whatever materials were at hand would be fashioned into form two hold water and other liquids.
Bamboo is light and sturdy so I'm guessing these glasses are very effective and quite durable. I wouldn't mind owning one, myself!
I upvoted this post and followed you. Feel free to follow me back. Good luck on Steem!