This is for a camper, traveler or commuter choosing between three kinds of portable coffee maker. The facts come from the makers' own pages (OutIn, Wacaco) read on 2026-10-20, and from our own AeroPress guide. We have not tested any of these machines. Pressure figures are what each maker says; we do not know how each was measured, so do not treat them as a quality ranking.
The three routes side by side
| Route | What it needs | What the maker states | Watch for |
|---|---|---|---|
| Battery machine with heater OutIn Nano 1, Nano 2, Mino | A charged battery, water, coffee. No stove. | 670 to 740 g. 20 to 22 bar. Heats water in 149 to 200 s (OutIn lab). Up to 5 to 9 brews per charge from room-temperature water. | Charging, weight, and brews-per-charge that reviewers on OutIn's site say they did not reach. |
| Hand pump Wacaco Minipresso GR2, Nanopresso, Picopresso | Hot water from a stove or flask, and your arm. | Minipresso GR2: hand powered, 285 g, "does not heat up water". Nanopresso: up to 18 bar by hand, "does not heat water". Picopresso: naked portafilter, 52 mm 18 g basket, "does not heat up water". | You need a source of hot water. Picopresso is for someone who will "master the art of manual espresso making", in Wacaco's words. |
| AeroPress | Hot water, a paper filter, a mug. | Our guide lists the Go at 11.5 oz with its travel mug, with micro-filter paper and minimal cleanup. | A different method from a pump machine. Our guide classes it as immersion plus pressure brewing. |
Sources: outin.com product pages and Wacaco's product pages (wacaco.com), both read 2026-10-20; our AeroPress guide.
The real trade
The question is where the heat comes from. A hand pump or an AeroPress takes hot water from a stove, so the stove, fuel and pot are part of the kit. A battery machine heats the water itself, which OutIn puts at 149 seconds for 50 ml on the Mino. You pay for that with a charger to remember, a battery that wears, and a heavier body. If you already boil water for dinner or tea, the heater saves you little. If you do not carry a stove at all, it is the only route on this page that works without one.
What these sources do not say
- No page we read compares the three routes side by side, and we ran no test.
- Bar figures are the makers' claims, measured in ways the pages do not show.
- We did not read pages for Staresso, Flair, Handpresso or Cafflano, so this page says nothing about them.
- Prices move, so we give none. Check each page on the day you buy.
The simpler option
If you only want a good cup outdoors, start with the AeroPress. It has no battery, no pump and no heater to fail, and our guide covers the weight and cleanup trade. Move to a pump or battery machine when you specifically want espresso-style pressure.