Being an outdoorsmans, this one interests me!http://www.briangreen.net/2012/03/coffeebrewer-trail-coffee-at-its-best.html
An alternative, if you don't want extra trash, can be found at many outdoors stores. They sell a plastic french press/mug. It's bulky, but it retains heat very well. Also, by the end of the mug, you are drinking diesel.