It is robust, breaks and so burst is not the same when it gets dropped times. Luckily, she is big as a thermos, but not so thick. They can include excellent and keep loose long with one hand. Slides doing nothing.
In an emergency, you hang it thanks to a flexible belt on bottleneck somewhere, so it is readily available.
What I find particularly impressive is the design of the closure: A full turn, that's it, .. open. A back and everything is seriously determined. No matter what happens, it runs not out. So it must be that I missed long.
Apart from all the above aspects, it always looks good, if only because one can choose his own design from 5 different and does not rely on the same old. Why Amazon the thing is being touted as low here is beyond me ... but great. Found it does not cost 10 but sometimes up to 20 Euro - 5 Star entitled.