UltraSpire SoftFlask 500ml with Bite Valve - Hydration Vest Compatible

Keeping your rhythm on the rolling hills of the Salt Marsh Trail is a lot easier when you aren't listening to the constant slosh of a half-empty plastic bottle. The UltraSpire SoftFlask 500ml is the perfect companion for your hydration vest or waist pack, designed to shrink as you drink. This eliminates air from the bottle, keeping your water quiet and your center of gravity stable. Equipped with a high-flow, self-sealing bite valve, it delivers effortless hydration when you're redlined on a climb, then tucks away easily once empty. It’s a simple, soft, and durable solution for runners who want to carry their water without the bulk.

• Collapsible Design: The flexible TPU material shrinks as you hydrate, significantly reducing water movement and "sloshing" while allowing the flask to be stashed in a pocket when finished.
• High-Flow Bite Valve: Features a soft, self-sealing silicone bite valve that provides a steady stream of water with minimal effort and stays leak-proof between sips.
• Universal Vest Fit: Specifically shaped to slide easily into the front pockets of most major hydration vests and specialized running packs.
• BPA & PVC Free: Constructed from food-grade, taste-free TPU that is rugged enough for the trail but safe for daily use.
• Wide-Mouth Opening: Makes it easy to fill at the tap, add ice cubes for those humid afternoon runs, or stir in your favorite electrolyte powder.
• Easy to Clean: The soft material is durable enough for the top rack of the dishwasher (remove the valve first) for quick and easy maintenance.

Best For

• The Effort: Daily training runs, trail racing, and hiking with a hydration vest.
• The Goal: Silent, bounce-free hydration that doesn't take up space once it's gone.
• The Conditions: Every adventure—from humid coastal road loops to dusty backcountry singletrack.

Technical Specifications

• Capacity: 500 ml / 17 fl oz
• Weight: 34 g / 1.2 oz
• Material: BPA, Phthalate, and PVC-free TPU
• Valve Type: High-flow silicone bite valve
• Compatibility: Fits most standard running vest front pockets