I just posted this idea and then read this.  I think it's a great idea myself!  It would likely be awkward trying to implement, especially at a drive-thru location, but if customers had them and were told to give them when paying, the barrista could put it on the coffee before handing it to the driver.  Superstore in Airdrie, AB  just went " plastic bagless", so I am sure our town is all thinking 'environmentally friendly".  I know I would buy one!

I'd buy one. Or two.

I'd love them. I used to use one from my fav little drive by coffee place when we had no Starbucks in the town I lived in...I used it for years until it died. I'd buy one and a few more for stocking stuffers/b-day card gifts. Go for it!

I know I would buy one. I always want to use a sleeve on a tall beverage. A reusable sleeve would be a great idea! It would cut down on waste and be a cool stocking stuffer idea.