Electricity comes in all shapes and sizes throughout the world. You will need to adapt your equipment’s plug in devices for the visited country. An example of this is the adapting of the two, flat-pin plug used in the US, Canada, and Mexico to the round-pin type used in France and Italy. These adapters are small devices available in camera stores and through amazon and other on-line sellers. They take up little space in the backpack. See these websites for descriptions of plug-in devices worldwide http://www.kropla.com/electric2.htm and http://www.xmarks.com/site/www.kropla.com/electric2.htm
Surge suppression is an issue in any country but you can overcome this by packing a small power strip with built-in surge suppression. The power strip will also allow you to plug in several devices, camera battery charger and computer for example, while using one adapter. While a surge suppressor can protect equipment from a power surge to a degree, it is best to shut off equipment during an electrical storm and best not to leave equipment plugged in unattended.
The multi-outlet power strip will be helpful because hotels are usually lacking in power outlets.
If you love to travel and make photographs while traveling you will probably want to travel lightly, that is with a minimum of equipment.
You can pare down your equipment to the bare minimum needed to make photos that you can sell or share with others by acquiring a few compact devices: notebook computer, power adapter, remote hard drive, and camera. That equipment will fit in a backpack with room to spare. Within that pack you have all the equipment necessary to create photos, write captions, and upload the images and text to a photo editor, magazine editor, or photo agency.
A look through the adds to the right and you can shop all the equipment that makes it possible to make photographs while traveling lightly.