Dreaming of a briefcase means getting prepared and that you are ready for any journey. The briefcase will contain everything that you need to get the task on hand completed to the best of your ability. The tools you need will be contained within the briefcase. Take a look around you, and see what you would put into the briefcase will determine your chosen career and life path.
If you are going away to a different country, be mindful to bring your briefcase or suitcase with all the necessities to ease you on your journey.