What is an Aeropress?

The Aeropress is a portable plastic coffeemaker made of a brewing tube and a piston, invented in 2005 by American engineer Alan Adler (also the designer of the Aerobie flying ring). It combines short immersion and moderate manual pressure (1 to 2 bars) to produce a concentrated or long coffee in 1 to 2 minutes, filtered through a disposable paper disc.

The Aeropress was patented by Alan Adler in 2005, at 67, an aerospace engineer and Stanford lecturer already known as a prolific inventor (flying rings, model gliders). The stated goal was a fast, single-cup coffee without bitterness, accessible to home users. Success came quickly in 2008 with the launch of the World Aeropress Championship, an annual competition now held in more than 60 countries, with the global final rotating between host cities each year.

The device is ruthlessly simple: a copolyester plastic cylinder, a piston with a rubber seal, a screw-on filter cap, and round paper filters (85 μm thick). Two methods coexist. The upright method: filter and cap screwed on at the bottom, coffee and water added on top, piston pushed down to extract through the filter into the cup. The inverted method: Aeropress assembled upside down with the piston partially seated, free immersion inside the tube, flip and press over the cup at the last moment.

Pressure peaks at 1 to 2 bars, far below the 9 bars of a pump espresso machine. The Aeropress does not produce true espresso; it produces a hybrid between immersion (French press) and filtration (V60), concentrated enough to be diluted as an 'Aeropress americano' or drunk as-is. The thin paper filter retains oils and fines, giving a cleaner cup than a French press while keeping slightly more body than a pourover.

Versatility explains its popularity. With 250+ documented recipes (championship, blogs, books), it can mimic an espresso, a filter-style long brew, a fast cold brew, even a coffee cocktail. At 200 g, unbreakable in plastic and electricity-free, it is the travel coffee tool by consensus. In Belgium, it is widespread at home and in offices, and regularly used at the Belgian national round of the world championship. Technical bonus: third-party metal filters (Able Disk, Fellow Prismo) reshape the cup profile entirely.

Aeropress — key data and variants