The Nanopresso is a self-contained espresso machine that is so compact that you can take with you anywhere. You will never be without espresso again, no matter where you are. The patented pumping system is capable of reaching a maximum of 18 bars (261 PSI) of pressure during extraction. This means superior coffee for your taste buds. It measures just 6-inches long and needs no power source. Just pump it manually and take it with you while camping, at the job site or anywhere. It holds 2.7 ounces of water and has an easy to clean filter system. Coffee when you want it, right from your pocket.