This is my solar backpack. It has three solar lighting systems on it which I use for my lights when riding my bicycle at night. I've been using it for four or five years now, hasn't failed me yet, and cost a little over $60 to put together.
Dirty F*ck*ng Solar Hippie Backpack
Simple Solar - Part 1: Solar Cookers Simple Solar - Part 2: Parabolic Concentrators Simple Solar - Part 3: Windowbox Air Heater Simple Solar - Part 4: Energy Basics