HydraPak UltraFlask Speed 500ml - Running Soft Flask - SpeedFill Cap

When you’re deep into a long Saturday morning run through Point Pleasant or winding through the trails of the Musquodoboit Valley, your focus should be on your cadence, not your gear. The HydraPak UltraFlask Speed 500ml is the gold standard for running vest hydration, offering the perfect balance of flexibility and stability. Designed with a signature wider form and a durable 3D welded bottom, this flask sits snugly in your vest pockets without the annoying "sag" or bounce of narrower bottles. The SpeedFill™ flip-top cap is a game-changer for mid-run refills—pop it open in one motion, top it up at the tap, and snap it shut without ever having to unscrew the lid. It’s lightweight, completely collapsible, and built to keep your focus exactly where it belongs: on the next mile.

• SpeedFill™ Cap: A secure flip-top lid that allows for lightning-fast refills at aid stations or trailside taps without the need to remove the cap from the flask.
• 3D Welded Bottom: Provides a structured, stable base that helps the flask maintain its shape and sit securely in vest pockets even as it empties.
• Compressible Design: The soft, pliable TPU material shrinks as you drink, eliminating water sloshing and reducing the flask's volume as you go.
• High-Flow Bite Valve: Features an auto-sealing valve that delivers a steady stream with a gentle bite and prevents any mid-run drips.
• Large 42mm Opening: A wide-mouth neck makes it easy to add ice cubes, scoop in your favorite electrolyte mixes, or even pair with a 42mm water filter.
• Lightweight & Durable: Constructed from abrasion-resistant TPU with RF welded seams for superior strength and longevity without the added weight.

Best For

• The Effort: Long-distance training runs, trail racing, and ultramarathons.
• The Goal: Stable, bounce-free hydration with the fastest possible refill times during races.
• The Conditions: Warm summer mornings, coastal trail loops, and high-intensity race days.

Technical Specifications

• Capacity: 500 ml / 17 fl oz
• Weight: 42 g / 1.4 oz
• Dimensions: 240 mm x 55 mm / 9.4 in x 2.2 in
• Material: TPU, PP, Silicone, POM, 304SS
• Sustainability: 100% BPA & PVC Free; Top-rack dishwasher safe