Turn your Jetboil stoves or cup into a French Press coffee maker! The shaft unscrews to pack neatly into the stove. With this coffee piston, you get better coffee than with a regular drip-filter technique.
Best results come with a coarser grind than your average filter-ground coffee. Measure as usual. If you don't know what "usual" is, try 30 g of coffee per 500 ml of water.
Jetboil has great foresight to design stuff to be future-proof and backward compatible. Here's a list of compatible models:
Julian W.