Hydro Photon SteriPEN Sidewinder - $99.95

Forget about wearing out your battery unless you have tennis elbow. The SteriPEN Sidewinder water purifier runs on elbow grease to destroy (their word, not ours) bacteria, viruses, and protozoa. The Sidewinder includes a one-liter Tritan BPA-free bottle and a SteriPEN pre-filter for use before UV treatment if water contains particles. - $99.95