Two years ago, students Anna Stork and Andrea Sreshta sought to create a simple, reusable light source for Haitian earthquake victims. Their LuminAid turned out to be as useful at a campsite as during a catastrophe. A solar-powered lithium-polymer cell and an LED light sit inside an inflatable, waterproof bag. Four hours of sun exposure yield six to eight hours of run time. Hang it in your tent, or float it beside your canoe to illuminate a night paddle. When deflated, the bag is an easily stowable 8-by-12-inch sheet. [$15;]