Works well for its intended purpose. The finger loop could be smaller.
A mug that goes into a small space. Convenient for races. The only downside is maybe the price.
Good light cup. Works really well for drawing water from a stream. Can be nicely rushed into your pocket and quickly used from there. This, when you put the old-fashioned ski ticket string and hanging from its backpack, would make the Mug available to the collector.