Hydrapak UltraFlask+ Filter Cap

The HydraPak UltraFlask+ Filter Cap is a versatile hydration solution that combines a soft, collapsible flask with an integrated high-flow filter cap, allowing you to safely drink from natural water sources on the go. Featuring HydraPak’s advanced 42mm filter, this filter cap removes 99.99% of bacteria, protozoa, and microplastics, delivering clean, fresh-tasting water with every sip—ideal for trail running, hiking, backpacking, and travel.

This system is designed for quick, squeezable hydration and includes a self-sealing bite valve for spill-free sipping, plus easy refilling at streams, lakes, or taps. The durable, flexible flask fits comfortably in vest, pack, or hand pockets and collapses as you drink to minimize bulk and weight. The filter is rated for up to 1,500 liters (400 gallons), delivering long-lasting protection with minimal flow resistance.

Trail runners, hikers, backpackers, and endurance athletes who need reliable, on-the-go water filtration without added weight or bulk. Stay hydrated and protected with the HydraPak UltraFlask+ Filter Cap—your all-in-one, clean water solution for fast-moving adventures.

Key Features

• Integrated 42mm filter cap removes 99.99% of bacteria, protozoa, and microplastics for safe drinking water
• Lightweight, soft-sided flask collapses to save space as you drink
• Self-sealing bite valve prevents leaks and controls flow
• Durable and flexible material fits easily in running vests or backpack pockets
• Easy-to-clean design; filter rated for up to 1,500L (400 gallons)
• BPA and PVC free—safe for you and the environment
• Compatible with HydraPak’s 42mm, UltraFlask, and other Standard 42 flasks