This is the coolest way of staying cool available in the market AFAIK. It doesn't look bulky. You basically just have to add water and that's it, The price is reasonable and might even call it cheap if you are a constant traveller/hike type. Personally I hate sweaty hikes. But with something like this, a person could at least bear the suffering while looking awesome.
I hope they'd get good sales. ExtremeMist even made replacement parts available so you don't have to get a new product when something goes wrong. This is real ehical customer centric selling. Props to that!