Well first start with your laptop – make it as light and as powerful as you can afford. I say light, because anything that weighs more than 5lb is going to be one laptop that you really hate after you have hauled it around for a few hours. Some models have CD/DVD units that plug in to the main PC. These are useful if you leave them behind or pack them separately. I prefer them to be included if possible. A small mouse and slim mouse pad – the latter which stores inside the “clam” of the laptop when traveling to protect the screen – completes your basic office.