Jim and I have gone through a variety of chargers over the years and what we have learned is SIMPLE IS BETTER.
We have bought fancy sleek chargers made specifically for digital equipment that turned out to be dead weight in our luggage because they were pretty much useless. We bought fancy voltage converters that weighed much too much for something so small and were too complicated to bother with after a long day of touring.
So....... Jim and I have whittled our charger needs down to a convenient but optimal minimum. Here are our recommendations.
1. DON'T BRING YOUR HAIR DRYER!!! Most moderately priced hotels offer them in the bathrooms. If you are staying on the cheap, wear a hat or a pony tail (for us long haired ladies). You really don't want to haul around a large thousands watt converter.
2. WE ALWAYS TAKE 2 SMALL CONVERTERS. Marital (or Companion) bliss requires that you do not share a converter. Arguments over charging time can ruin a vacation!
These can be used to charge nooks, tablets, camera batteries, phones and other small items. Make sure to check the voltage needs on your electronic devices, because the small converters (at least the ones we use) are usually around 50 volts. Again, you don't need to make these super-fancy complicated converters with buttons and dials. You won't want to spend time figuring them out.
With all the devices couples carry these days, you absolutely need at least 2 converters. That way you can rotate charging. (ie. Charge nooks and kindles during the day while you are gone and phones over-night).
BEWARE! You can only charge during the day if your room electricity stays on when you are gone. Some hotels turn the sockets off with the lights while you are out during the day. I have arrived back at the room a time or two only to find that my laptop wasn't charging all day as I had thought.
We have an ancient JENSEN converter that is light weight which we love. It has traveled with us for years. Unfortunately you will have a hard time finding these super light small converters any more because most if not all of the manufacturers have upgraded to the heavier version. We also like the lightest model of the DYNEX converter. Often, the heavier converters need to be propped up (I use my hand luggage) since they tend to slide out of the sockets otherwise, so be prepared for this. Someone really needs to fix this problem!
3. ANOTHER EXTREMELY IMPORTANT THING TO REMEMBER. Bring at least 4 adapters per couple (two each). You know.... those little pronged plug adapters that adapt to your two pronged U.S. plug to the outlet of whatever country you are in.
The trick to these adapters is to remember that most of the sockets in other countries are mysteriously recessed into deep holes. Even if you have the correct prongs, if you can't reach the sockets deep inside the recess, you converter is useless (I write from experience here because I lugged around a dead laptop for days because I couldn't reach the darn socket!) So be sure to bring the round or square adapters that fit into these strange holes. (SEE PICS).
4. LAPTOPS. Fortunately, laptops come with their own converters, so all you need are the above adapter for the plug.
5. ONE LAST RECOMMENDATION. Bring at least one set of converters/adapters in your carry-on luggage, just in case your checked bags go for a tour of their own!