Whether your preference is a PC or Macintosh, your laptop will be a necessity with your portable music production tools. Music production software is available in abundance for both types of computers. Compact-sized MIDI controllers are also available for convenience when traveling. Most are powered up by connecting to the computer so needing a plug won't be necessary. Be sure to always remember the connective cords.
The music production software you use for portability should have the ability to recognize your computer keyboard as a trigger for drum beats and instrument notes. This way, if you are traveling and do not want to carry a MIDI keyboard or MPC drum pad or don't have enough room to use one, your laptop will be sufficient enough to get the job done.
Noise-canceling headphones are must with portable music production tools. If you are on a bus, train or other public place where there is noise, a good pair of these headphones will let nothing separate you from the sound of your beat. Find them at any music hardware or software vendor.
Investing in a travel bag that comfortably holds all your portable music production tools in one place will make for hassle-free traveling with your equipment. Find them in most stores selling computers, office supplies or music equipment.