I play a lot during the summer, and I play outside!
That means that I often get thirsty during the gig. Ofcourse, you can hold your water bottle (or any other bottle) anywhere, it's not such a big deal. But it turns out that sometimes it's not so easy to find a spot where there is no danger of spilling your drink, or where it won't be too much out of your reach.
This is excellent solution, very practical and quite sturdy. I really believe it will last a lot of years, it definitely seems robust enough.
Your drink will always be very near you, and there will be no danger whatsoever of spilling it.