When I travel, I tend to bring a lot of interesting gear along with me, and much of that gear is designed to support my other gear. I never know what I might need, so I plan for the worst and try to bring a little bit of everything. For example, I have various chargers for phones/tablets/notebooks, etc., plus a variety of USB/Network cables and adapters, and when I'm travelling overseas I bring adapters for international electrical outlets.
However, I have often found myself at a loss for power outlets in various airports, so last year I invested in an Indiegogo campaign to support a device which I thought needed to be brought to the market: Omnicharge. While it wasn't cheap, it promised 2 fast-charging USB ports and an actual AC/DC power outlet. And I must admit, the prospect of having a way to recharge my laptop and other devices was rather appealing.
During the Indiegogo campaign, I pledged the extra cash for the Omnicharge Pro (Omni 20), which boasts 20400mAh with a maximum output of 100W. The campaign was successfully funded at 4,257% of its original goal, (with a grand total of $3,185,869 pledged), so I guess that I wasn't the only traveller who thought this was an amazing device to add to their "go bag."
I received my Omnicharge a couple months ago, and I have had a chance to travel with it a few times. So far, it has exceeded my expectations. I have been stranded with a dying laptop and no AC power outlet on more than one occasion, and the Omnicharge has rescued my laptop each time. The Omnicharge's screen and menus are easy-to-navigate, and it completely charges my Microsoft Surface Book's drained batteries in an hour (while I am still using it).
Now that the Indiegogo campaign has long-since ended and backers have received their "early bird" releases, you can now purchase one of these devices through Amazon at http://amzn.to/2nnZgrw.
For more in-depth information about the Omnicharge, see the following video-based overview on YouTube: