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From the high mountain passes of Peru’s Cordillera Blanca, to high-traffic wilderness areas closer to home, the MSR Aquatabs water purification tablets quickly and reliably purify drinking water on-demand. They’re effective against viruses, bacteria and Giardia cysts, providing safe drinking water in just 30 minutes. Ideal for ultralight backcountry travel, they’re also great for international travel and domestic emergency use. And because they’re individually packaged, Aquatabs water purification tablets travel well, making the ideal emergency back-up to any microfilter. Throw a couple in your pack, you never know when you'll need them.