Hydrapak UltraFlask+ Filter Cap

If you're anything like us, you have a particular fondness and gratitude toward water. When it's frozen, we ski on it, and when it's liquid, we use it to survive. If you're already pushing yourself in high alpine terrain, it's tough to decide whether water is going to be worth its weight. Backcountry skiers are known to be clever; we've found a way to drink natural water safely. The Hydrapak UltraFlask Plus Filter Cap filters out up to 99.99% of common waterborne bacteria such as E.coli and parasitic cysts. The flask was designed to minimize the number of moving parts when taking your cap off and putting it back on during a pit stop. So whether it's a stream crossing or you need to load up your flask with solid-state water until it melts, the filter will keep you safely hydrated for the Grand Traverse, rather than parched on the Oregon Trail.

• Involves high tech defrosting system if used with snow (put the flask inside your jacket to change the state to water).
• Bite-valve connected to filter makes for fewer parts to juggle when you're filling up the flask.
• Effectively filters up to 99.99% of common water-based bacteria and microorganisms.
• Compatible with standardized 42mm soft flasks.

*Avoid freezing filter. Freezing may ruin the hollow fiber membrane. We recommend keeping the filter in your pocket or close to your body to prevent freezing.