One charging kit that works in every country
You don't need the drawer of tangled adapters. For almost any trip, a kit the size of your fist charges everything you carry, in any country, and you can pack it in about ten seconds.
The mistake most people make is buying a separate adapter for every region, then a separate charger for every device. It piles up, and half of it stays in the hotel drawer anyway. A smaller kit built around one plug and one charger does more with less.
Start with a single universal adapter
One all-in-one adapter with the US, UK, European, and Australian pins built into a sliding body handles the vast majority of countries you're likely to visit. Buy one that has a couple of USB-C ports in its face, because then the adapter is also a charger, and you've combined two things into one.
Worth knowing: an adapter changes the shape of the plug, not the voltage coming out of the wall. That's fine for anything with a modern charging brick. Check the small print on the brick and you'll see something like "100 to 240V," which means it already handles the difference between North America and most of the rest of the world. Where people get caught is hair dryers, straighteners, and other heating appliances, which often are not dual voltage and can fail loudly on foreign power. Leave those at home and use the hotel's, or buy versions rated for travel.
One charger, a couple of cables
A single compact charger with two or three USB-C ports can run your laptop, phone, and earbuds at the same time. Look for one labeled GaN, which is a newer design that packs a lot of power into a small brick. A 65-watt model is plenty for a laptop and a phone together.
For cables, carry two USB-C to USB-C, and add a USB-C to Lightning if you still have older Apple gear. I keep one short cable that lives in the day bag and one longer one for the gap between the outlet and the side of the bed, which is always six inches too far.
A small battery for the day
A 10,000 mAh USB-C power bank tops a phone up roughly twice and weighs almost nothing. That covers a long day of maps, photos, and boarding passes without hunting for an outlet. One rule that trips people up at security: spare batteries and power banks have to travel in your carry-on, never in a checked bag. A 10,000 mAh unit is well under the airline limit, so you're fine, but it has to be in the cabin with you.
What I actually pack
The whole kit is a universal adapter with USB-C ports, one 65-watt GaN charger, two USB-C cables, and a 10,000 mAh battery, all in a small zip pouch. That runs a two-week trip across several countries and a couple of devices without a second thought. Everything in the pouch talks to everything else, so there's no moment at 11pm of realizing the one cable you need is the one you left home. Pack it once, and charging stops being something you plan around.