Solar backpacking shower bag. Pretty basic idea, just absorb the sun enjoy a hot shower. It's definitely worth a couple of ounces.
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Designed for use during camping, the PowerPot can be used as a standard saucepan - but it has a hidden secret in the form of thermoelectric power generation hardware. Connect the included wire to a USB-compatible gadget, such as a smartphone or tablet, and heat from the cooking process is turned into electricity to charge the device.
The PowerPot. this one goes straight to the gadget-toting-camping-folk-essentials. cooking and charging at the same time, it couldn't get more perfect than this.