This backpack combines 4 components: bag + sunlight cell panel + battery field + adapters together as a way to charge most moveable electronics mobile phones, iPods , PDAs, and GPS. *** At ease design with additional width and cushion for shoulder belts. *** Chest and waist buckles, and cell phone bag embedded. ***It’s not designed to charge laptop. The capability may raise a pc. *** Top for backpacker, sports fan and out of doors employees.