Patented Zen Massage: Backpack has built-in massagers that powers on by a adjustable button and runs off your normal cellphone battery(not included) that every customer is carrying these days,so now you can charge your cellphone and get a massage at the same time! USB Charging Port: Travel Backpack with charging port offering a quick access to charge your phone and other electronic devices like Amazon Kindle devices, iPad, laptop and all other USB devices conveniently and freely. (Portable Battery pack is NOT INCLUDED) No specific battery pack is required. Addd-a-bag system convenient your travel. A luggage belt lets you pull your suitcase with one hand for easy travel.