Technological advances in backpacking equipment. it was choose your own topic, and I have to have a 10 hour product to go with it so i chose that for an excuse to do some A.T. this spring.
you could talk about the transition from external frame packs to internal frame packs. Theres all kinds of crazy designs out there. I think the military even has a backpack that uses the movement of your body to charge a device http://www.freepatentsonline.com/6982497.html
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