OutIn Nano – A Compact Espresso All-Rounder With Tuning Potential

Espresso on the road, no stove, kettle, or full barista setup required? For €149.99, the self-heating OutIn Nano promises convenient coffee from a device the size of a thermos flask. Sounds practical. But how much real espresso does this camping espresso machine actually deliver?

This review is part of our group test of the best camping espresso makers, in which eight different concepts go head-to-head, from the classic stovetop pot to the electric mini portafilter machine. For an overview of all the contenders, head to our buyer’s guide.

Table of contents

1. First Impressions: Design, Materials & Feel
2. OutIn Nano in Review: How Does the Camping Espresso Machine Work in Everyday Life?
3. Who Is the OutIn Nano the Right Choice For?
4. Does the Camping Espresso Machine Deliver on Its Promise?
5. Conclusions
6. The Test Field

When the OutIn Nano appeared in 2023, it wasn’t the first self-heating portable espresso machine on the market. Nevertheless, the American manufacturer quickly became a hype product thanks to a simple, easy-to-understand promise: better coffee on the road, one-button operation, a clean thermos-flask design, and no need for a stove, kettle, or lengthy barista rituals.

In our group test, the OutIn Nano enters the race as a self-heating camping espresso machine, which puts it in the same category as the IKAPE K2 Pro and Handpresso E-Presso. Yet it isn’t a miniature portafilter machine for fine-tuning fans like the IKAPE. It’s clearly built around convenience. The manufacturer promises simple operation, a short heat-up time, and a powerful battery. Tipping the scales at 630 g, the Nano holds up to 80 ml of water and works with both ground coffee and coffee capsules.

But how much genuine espresso lies behind that convenience promise – and where does the OutIn Nano reach its limits?

First Impressions: Design, Materials & Feel

The OutIn Nano’s ambition to make espresso on the road as accessible as possible is obvious from its design: clean, compact, and self-explanatory. It looks more like a modern thermos flask than a conventional coffee machine, making it easy to picture in all kinds of settings from the moment you unpack it – in a van, on a train, or even in a conference room. The Nano is also well made. The tank is stainless steel, and the ABS body feels good in the hand. The plastic filter holder, however, keeps the Nano below the IKAPE K2 Pro’s high-end level, though the material choice pays off on the scales. At 625 to 630 g, depending on whether capsules or ground coffee are in use, this is the lightest self-heating machine in the test field.

OutIn Nano in Review: How Does the Camping Espresso Machine Work in Everyday Life?

Ease of Use, Brewing Workflow & Control

The OutIn Nano doesn’t play to its strengths through fine-tuning, but through everyday convenience. While the IKAPE K2 Pro deliberately moves closer to a portafilter machine with its app, pre-infusion, and barista accessories, the Nano takes a much more accessible approach to coffee preparation. The biggest strength of this camping espresso machine is its self-heating mechanism, which simplifies the preparation process considerably. Unlike the AeroPress, Bialetti, Flair, or 9Barista, it needs neither a stove nor separately heated water. The Nano handles that itself before dispensing the espresso at a pleasant drinking temperature. You can still introduce a little barista feeling into the process. Just like with its Chinese rival within the test field, the Handpresso E-Presso, you can use your own hand grinder to experiment with grind size instead of relying on pre-ground coffee. You’ll also find our review of the camping version of the Comandante X25 hand grinder on our site.

Capsules make the workflow particularly simple and consistent, but only if you use brands listed as compatible on the OutIn website. Our review revealed a significant difference between no-name products and better-known capsule brands. With the latter, the aluminium capsules were perforated cleanly, allowing the hot water to pass through the holes without issue. Other capsule products proved completely unusable. Their shape apparently deviated so much from the original Nespresso design that the Nano managed to pierce only a handful of holes. The resulting coffee? Pretty poor.

And what about ground coffee? In principle, the ground-coffee mode is a better match for OutIn’s promise of delivering “better coffee on the road”. However, the standard 6–8 g basket places noticeable limits on the result. Espresso quality isn’t created by pressure alone, but above all by extracting the coffee bed as evenly as possible. Small, simple baskets with only a little ground coffee leave less room to get this right. The puck is shallower, the dose smaller, and the extraction significantly more sensitive. As a result, the Nano’s standard setup produces a small, simple espresso rather than a competition-level barista shot. That also explains why OutIn offer the Basket Plus. With its larger single-wall basket, tamper, dosing tool, and distribution tool, it brings the Nano closer to producing a fuller espresso – and closer to the IKAPE K2 Pro.

At the same time, it raises the question of why OutIn don’t include this improved basket as standard, instead offering it only as a €39.90 accessory. In its full configuration, the Nano would have stood a much stronger chance of winning this group test, even if the extra equipment would nudge it slightly away from its refreshingly simple standard workflow.

How Practical Is the OutIn Nano in Real-Life Camping Scenarios?

At the campsite, the Nano is strongest wherever space is tight and coffee needs to stay simple. The concept works particularly well for vanlife, road trips, and campsites. The camping espresso machine is compact and intuitive to use, without the need for a separate hot-water source. Cleaning is equally straightforward: remove the capsule or rinse the basket. Done.

However, like most camping espresso machines in the test field, the Nano meets its match in a queue. One cycle, one single shot. The IKAPE at least delivers a doppio per run, which halves the waiting arithmetic. Anyone wanting to make several espressos in succession will therefore need to allow enough time. Using preheated water from a stove shortens the process considerably, but also takes away part of the Nano’s biggest advantage: independence from an external hot-water source. And as with all battery-powered machines, you’ll eventually need access to electricity on longer trips.

Who Is the OutIn Nano the Right Choice For?

The OutIn Nano is aimed at those who want to make espresso on the go with as little effort as possible – without lots of accessories or a full barista workflow, unless they deliberately add one with the optional extras. This camping espresso machine is particularly well suited to vanlife, road trips, campsites, holiday apartments, hotel rooms, or the office. Anyone who wants to experiment with grind size, pressure profiles, and extraction will be better served by the IKAPE, Flair, or 9Barista.

Does the Camping Espresso Machine Deliver on Its Promise?

Partly. As a compact convenience machine, the OutIn Nano gets the essentials right: operation is simple, and the water heats itself. The small standard basket and restricted capsule compatibility, however, place clear limits on the espresso itself. Only with the optional Basket Plus does the camping espresso machine make better use of its potential with ground coffee.

Conclusions

As a compact convenience machine for the road, the OutIn Nano makes its case: light, simple to operate and independent of any stove or hot-water source. The limits sit in the cup. The small standard basket caps espresso quality, capsule compatibility is patchy, and the optional Basket Plus, which draws considerably more from ground coffee, feels less like an upgrade than a correction. For road trips, vanlife and anyone who rates uncomplicated espresso above barista fine-tuning, the Nano fits the brief.

Tops

• Very simple workflow without a stove or kettle
• Several brewing options, including capsule compatibility
• Compact, easy to understand, and travel-friendly
• The lightest self-heating espresso machine in our review

Flops

• Small standard basket limits espresso quality
• Not compatible with every capsule product due to its design

For more info, visit OutIn.

This article is part of our Coffee Special, full of product tests, exciting insights and some valuable new perspectives on coffee. Curious? Then click here!

Are portable espresso machines your main focus? We’ve also reviewed the Wacaco Picopresso.

The Test Field

All machines reviewed: AeroPress Go Plus | Bialetti Moka Express | Ciarra BloomBox | Flair 2GO | Handpresso E-Presso | IKAPE K2 Pro | 9Barista Stovetop Espresso Machine Mk.2 | OutIn Nano

Words: Felicia Nastal Photos: Tim Eckermann