10. Eco-Made iPhone Amplifier
© eco-made
If you're not hiking far, bringing a set of portable speakers for your smartphone for when you set up camp is no big deal, but if you're getting far away, you want to keep your pack light. The Eco-Made iPhone amplifier is a flat-pack folded cardboard amplifier that stows neatly in your pocket or backpack and then can be popped up to pump up the sound of your music in your tent. It won't be enough for a party, but for some tunes around the campfire, it's an easy and lightweight solution.
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http://www.youtube.com/watch?feature...jtY8lUdE#at=29