HydraPak UltraFlask+ 500ml - Filtered Soft Flask

The perfect trail run is the one where you don't have to turn back because your bottles are empty. The HydraPak UltraFlask+ 500ml is the ultimate "freedom" upgrade for your running vest. While it retains the signature stability and 3D welded bottom of the standard UltraFlask, the "+" indicates the integrated 42mm Filter Cap. This means you can dip your flask into a clear backcountry stream or a lakeside trail tap and safely hydrate on the fly. It removes 99.99% of common bacteria and protozoa, effectively turning every water source into a refill station. Lightweight, collapsible, and designed to fit perfectly in your vest pockets, it's the ultimate insurance policy for long summer efforts where the humidity is high and the miles are long.

• Integrated Filtration: The included 42mm Filter Cap removes bacteria and protozoa from approximately 1,500 liters of water, letting you refill from backcountry sources with confidence.
• 3D Welded Bottom: Provides a structured, stable base that keeps the flask upright in your vest pockets, preventing the "sagging" or shifting that happens with standard flat-bottom flasks.
• Vest-Optimized Shape: Specifically contoured to sit flat against your chest, minimizing bounce and pressure points during high-cadence efforts.
• High-Flow Bite Valve: Features a self-sealing valve that delivers water only when you bite down, ensuring a drip-free run while keeping the filter protected.
• Ultra-Lightweight TPU: Built with abrasion-resistant TPU and RF-welded seams for maximum durability, collapsing completely as you drink to eliminate water sloshing.
• Easy Maintenance: The filter can be backflushed to maintain flow rate, and the flask itself is dishwasher safe (top rack) once the filter is removed.

Best For

• The Effort: Long-distance trail running, ultramarathons, and fast-and-light backcountry hiking.
• The Goal: Extending your range without carrying the extra weight of multiple full bottles.
• The Conditions: Adventures near freshwater sources, high-humidity training days, and remote trail loops.

Technical Specifications

• Capacity: 500 ml / 17 fl oz
• Filter Type: Hollow Fiber (Removes 99.99% of Bacteria/Protozoa)
• Filter Life: Approx. 1,500 Liters
• Material: TPU, PP, Silicone, POM
• Weight: Approx. 100g (Flask + Filter)
• Sustainability: 100% BPA & PVC Free