I have some ideas on sports sunglasses, made specifically for the adventure racers. They would be used by rock climbers, eco-challengers, obstacle coursers, etc. They are somewhat like goggles, except without the tight feeling around the head. The tightness could be adjusted just before entering any water. The lenses have a UV protection agent to them. Draw-back - wear and tear. Due to the type of sport done, the sun glasses may not make but one trip, but then what sunglasses make...

It is like any other backpack, except the inside lineing is designed to keep books from having frayed eges, moving around, etc. This would be very good for any student who walks alot and throws those book in the bag while on the run to the next class.