UltraFlask™+ 500ml

I've been using this during my trail runs and love that I can drink directly from streams without worrying about bacteria. The filter is surprisingly light and doesn't add any noticeable bulk to the flask.

The filter screws right into the mouth so I'm drinking straight from the stream without hauling a separate pump. Filled it at a lake on a long hike and the water tasted clean, no aftertaste at all. Barely notice the extra weight in my vest either.

Took this on a 4-hour trail run and barely noticed the extra weight of the filter. The bite valve flows fast, which I didn't expect from a filtered flask.