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Although I can't think of many people who would need the Backpack Power Plant, that doesn't mean they're not out there. Actually, come to think of it, there are plenty of professions that could benefit from a portable hydroelectric power source.

Created by Bourne Energy, the Backpack Power Plant is much more convenient than a Power Bar. All it needs is a stream of water to produce electricity, and unless you're stranded in the dessert, that shouldn't be hard to come by.