I no longer carry a separate power adapter for my cell phone, my wife's cell phone, my bluetooth headset, my laptop, etc. when traveling. I carry one power adapter that charges them all and this converter is smaller than my laptop adapter so it doesn't add much weight. All you have to do is get a power adapter and tips that fit the devices you want to charge. Make sure the adapter can charge a laptop because some can't and make sure they have a USB port to charge your phone and other devices. For your USB devices you will use your USB cables that came with your device. Note: To keep those cables from getting tangled up put each one in a labeled Zip Lock bag. Other options to consider are air plane and car adapters and whether you want international wall power support.
There are several brands out there and the two I have tried are iGo and Kensington.
The biggest problem I had when I ordered an iGo a year ago was that the iGo web site was almost impossible to use. Although they listed all of the products they sold you couldn't figure out which parts went with each other. I gave up on them and switched to Kensington. However, I have revisited there web site to write this article and their web site has been completely rewritten and they even offer phone ordering and interactive internet sales support so you may want to try them.
My favorite is the Kensington 120 watt power adapter which they no longer offer. The best you can get now is 90 watts which should be enough. Kensington does not offer telephone sales or interactive internet support. Hopefully you won't need it.