Carry-on tech pouch: the complete list, nothing missing and nothing wasted

A good tech pouch isn't a full one. It's one where every item justifies its place, and above all where you find what you're looking for without tipping the contents onto the next seat or into a security tray.

The problem is rarely a lack of space. It almost always comes from accumulation: cables kept "just in case", duplicates, accessories for devices sold long ago. Here's the useful list, what to strip out of it, and how to organise the rest.

The frame: carry-on dimensions and constraints

Before choosing what to bring, it helps to know the container. IATA gives as a common reference a maximum of 56 x 45 x 25 cm, wheels and handles included, with weight limits that sometimes start at 5 kg depending on the carrier.

These are reference points only: each airline sets its own rules, and the gaps are real, particularly on low-cost flights where the free cabin allowance is often limited to a much smaller format, the kind of bag that slides under the seat.

This constraint has a direct consequence for the tech pouch: it needs to stay compact, but above all accessible without opening the whole bag. At security screening, electronic devices larger than a phone often have to be taken out and placed separately in a tray. If your pouch is at the bottom, under the clothes, you end up unpacking standing in the queue.

The logical place is the front pocket of a backpack or the top compartment of a suitcase. Which implies a pouch of about twenty centimetres in length at most: beyond that it no longer fits those pockets and migrates to the bottom.

The four essentials

A multi-port wall charger. One brick with two or three outputs replaces three separate chargers, and it's the single biggest space saving in the pouch. In USB-C with fast charging, it also powers most recent laptops, sparing you the manufacturer's proprietary brick, often the heaviest and bulkiest object in the bag.

Two cables rather than one. This is the part that fails most often, and the one you end up rebuying at a premium in an airport shop. One metre is enough in almost every situation: two-metre models take up noticeably more volume and, as research into spontaneous knot formation has established, tangle considerably more — knot probability rises with length.

A 10,000 to 20,000 mAh power bank. That's two to four full phone charges, comfortably below the 100 Wh regulatory threshold. Beyond that, weight climbs for capacity you won't use on a flight. Important reminder: it travels in the cabin, compulsorily, and since March 2026 it can no longer be recharged on board. Charge it to 100% before you leave.

A plug adapter matched to the destination. Worth checking before every departure, since standards vary even within Europe: the UK, Switzerland and Italy each have their own specifics. A universal model with built-in USB ports settles the question once and for all, and sometimes replaces the charger.

What depends on the trip

These items aren't universal. Packing them systematically is the leading cause of an overfull pouch.

Earbuds and their case if you travel by public transport or work in noise. USB stick or external drive if you handle large files, or want a backup independent of the cloud. Multiport adapter — USB-C to HDMI, USB-A, card reader — if you need to connect a projector in a meeting or offload a camera. Spare memory card for photographers. Headphone jack cable, still useful on many in-flight entertainment systems, whose sockets remain analogue.

A simple test to decide: if you can't name the precise moment you'll use it on this particular trip, the item stays home.

What people pack by mistake

Three categories come up every time, and they weigh more than you'd think.

Old cables kept "just in case". The micro-USB from a device sold two years ago, the cable from a previous phone, the charger for a speaker no longer in use. The phenomenon goes well beyond travel: according to the WEEE Forum, 950 million kilos of cables are thrown away worldwide every year, enough to circle the Earth 107 times. Most of it sits in a drawer for years first. Sort it out before departure, not after.

Duplicates. Two power banks, three adapters, four identical cables. One of each is almost always enough, and the regulatory cap of two power banks per person makes accumulation pointless anyway.

The laptop charger for a short trip. Over two days, most recent laptops hold up without a full recharge, or make do with the USB-C brick you're already carrying. The proprietary charger is often the heaviest object in the pouch, serving the most uncertain purpose.

Organising to move fast

Once the list is settled, the real question remains: fitting all of it into a reasonable volume and keeping it usable without spreading everything out.

The most effective split isn't by category of object, but by how each behaves inside a container that moves. Three zones are enough.

Small items that get lost — adapter, memory card, tips, USB stick — in a zipped pocket. A mesh pocket offers a genuine advantage at security: the contents can be read without opening it.

Things that coil — earbuds, short cable — coiled tightly and held by an elastic strap. Without that hold, the coil loosens within minutes of walking and the cable recovers its length, and with it its capacity to knot.

The bulk — charger, power bank — in an open pocket, visible straight away. This is also what lets you meet the obligation to isolate the battery from metal contact, since it then has a place of its own.

The container should be single, so there's one object to pull out at security, and structured, since a floppy pouch deforms and lets items migrate between zones. That's the logic behind our organizer pouch, in a 19 x 12 x 3.5 cm format at 110 grams.

Conclusion

The ideal tech pouch comes down to four permanent items — a multi-port charger, two cables, a battery under 100 Wh, an adapter — plus whatever each specific trip calls for.

The rest is discipline: stripping out what no longer serves before each departure rather than accumulating, and giving every object a defined place based on how it behaves inside a bag.

The benefit shows up exactly when you need it most: at security, a single pouch comes out in two seconds and goes into the tray as it is.

Frequently asked questions

What carry-on size is accepted?

IATA gives 56 x 45 x 25 cm as a common reference, wheels and handles included, but each airline sets its own limits. On low-cost flights the free allowance is often restricted to a bag that fits under the seat. Always check before departure.

Do I need to take my tech pouch out at security?

Electronic devices larger than a phone often have to be presented separately in a tray. Keeping the pouch in an accessible pocket, rather than at the bottom of the bag, saves you from unpacking while standing in the queue.

How many cables should I pack for a week?

Two of the same type is enough in the vast majority of cases: one main and one backup. The cable is the part that fails most often and the most expensive to replace urgently in an airport.

Does a universal adapter replace the charger?

Often yes, if the model includes USB ports of sufficient output. Check the stated wattage: many universal adapters cap at a level too low to charge a laptop quickly.

Can I bring a 30,000 mAh power bank?

It exceeds the 100 Wh threshold, which requires the airline's prior approval. A 30,000 mAh lithium-ion battery comes to roughly 111 Wh. Below 27,000 mAh, no formalities are needed.

How do I stop cables tangling during the journey?

By coiling them short and above all holding the coil with a strap or tie. Research into spontaneous knot formation showed that below 46 centimetres of total length, no knot forms. An unsecured coil loosens and cancels that benefit.

Sources

IATA, Passenger Baggage Rules and Guidance to Operators — Power Banks (addendum of 27 March 2026). WEEE Forum, statement on "invisible" electronic waste, International E-Waste Day. Raymer & Smith, Spontaneous knotting of an agitated string, PNAS, 2007.