OneAdaptr OneWorld135 review: power and portability packed into one

You probably already know that it’s Travel and Outdoor Month here at T3, and this week we’re diving headfirst into the world of travel gadgets. That means I’ve been testing out some of the best power banks and best travel adapters every single day – and now it’s time to look at our newest contender in the adapter game.

We kicked things off this week with the Epicka TA-105 Max World Travel Adapter, then switched gears to the Chargeasap Flash Pro Ultra. Now, stepping up to the plate is the OneAdaptr OneWorld135.

Known for its compact design and wide country compatibility, I was genuinely excited to see how this one stacked up, and you’ll find my full thoughts just below.

OneAdaptr OneWorld135 review: price and availability

The OneWorld135 retails for £98/$129 and is available directly from the OneAdaptr online store. That said, there are a few deals floating around right now (including up to 24% off if you buy multiple units) so check them out before buying.

Yes, it's a bit of a premium price, but I personally think it’s in line with other high-end travel adapters on the market.

OneAdaptr OneWorld135 review: design and features

Just like the Epicka adapter I reviewed earlier this week, the OneWorld135 works in over 200 countries. OneAdaptr even has a handy online World Power & Voltage Guide that lets you check if your destination is compatible with its products, which is surprisingly useful.

When it comes to charging, the OneWorld135 can charge up to five devices at once, delivering a combined 135W of power. There are three USB-C ports, two of which can deliver up to 100W. The third USB-C gives you 20W, which is ideal for smartphones or tablets. There's also one USB-A port with 18W output, for all your older USB-powered gear.

One of the things I love most about the OneWorld135 is the integrated plug system. It uses three sliding switches to reveal plugs compatible with the US, UK, Europe and Australia, so you don't have to worry about plug attachments.

It’s also surprisingly compact, measuring just 5.4 cm in depth, which makes it super easy to toss in your bag. You even get a little travel pouch to protect it in your luggage.

One thing to note is that the OneWorld135 isn’t grounded, meaning it lacks the third pin that protects against power surges. If you’re planning to plug in a device that requires grounding (like some laptops or appliances), this isn’t the adapter for that. That said, most modern travel gadgets don’t need grounding, so for the average traveller, you should be just fine.

I've also got to say that the colour of the adapter isn’t really doing it for me. The one I tested is bright blue, but it looks like a light grey version exists, even though it’s not available to buy on the website.

OneAdaptr OneWorld135 review: is it worth it?

The OneAdaptr OneWorld135 is a feature-packed, travel-friendly adapter that brings serious power to the table. If you’ve got multiple devices and need a reliable, compact solution whilst you’re hopping between countries, it’s a solid choice.

I'd strongly recommend it if you're a frequent traveller who juggles lots of gadgets. However, make sure your devices don’t require grounding, otherwise you may be better with a different choice.