I’ll start by echoing what others have already said: it seems a bit high priced for what it is, and the lack of insulation makes it somewhat unsuitable. It would be a cute accessory for those novelty canning jar mugs with handles, sure.
Honestly, I think a year or two ago I could have easily gotten on the front page of BB by writing about how I make cold-brewed coffee. No, really! I run about 6T of beans through a hand-crank grinder (Burr grinder! Ook!) and dump it into a pint canning jar with a solid lid; the lids came from salsa packaged in canning jars. (Repurposing! Ook!) I leave it overnight then put a filter in my coffee maker and pour the liquid and grounds into the coffee filter and wait a while. (More repurposing!) Et viola, cold brewed coffee and I didn’t have to buy any extra equipment. (OOK!)
I’m just kiddin’ ya, guys; I like seeing these kinds of gadgets, even if Treehugger would file them in the Just What The World Needed Dept.