Compact, fast to refill, and comfortable to carry, the HydraPak UltraFlask Speed 500ml is made for quick-moving days on the trail.Hydrapak says:The perfect balance of sleek and stable, our signature UltraFlask has a wider form and a durable 3D welded bottom. Soft and pliable material means you can fit it in most pack and larger vest pockets for a snug and secure fit. Topped with our SpeedFill Cap for quick refills.Our VerdictAt just 43g, the UltraFlask Speed 500ml is an excellent option for anyone who values lightweight design without compromising ease of use. The flexible body fits snugly into most vest pockets, and the wide 42mm opening makes it straightforward to fill with water, ice, or drink mix. I liked the SpeedFill cap for fast refills, and the bite valve delivers a steady flow without drips. – Reviewed by Ultralight Outdoor GearFeaturesVest Pack Fit: Soft material conforms to most hydration packs and larger vest pockets for a secure and stable fit.High-Flow: Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.Speedfill Cap: Designed for fast filling – flips open for quick refills and snaps closed for leakproof transport.Large Opening: 42mm opening lets you fill the flask easily with ice and drink mixes.Compressible: Flexible design shrinks as you drink, reducing water movement.Filter Compatible: Pair with 42mm threaded backcountry water filters including the HydraPak 42mm Filter CapDurable: Made of ultra-durable, abrasion resistant TPU & RF welded seams for superior durability and elasticity.100% BPA & PVC Free: Wide working temperature range (can be frozen – max temp 60 C / 140 F).SpecificationsWeighs: 43gCapacity: 500ml / 17fl ozDimensions: 240 mm x 55 mm / 9.4 in x 2.2 inMaterial & ConstructionTPU, PP, Silicone, POM, 304SSHelp & advice:What does BPA Free Mean?

Compact, fast to refill, and comfortable to carry, the HydraPak UltraFlask Speed 500ml is made for quick-moving days on the trail.Hydrapak says:The perfect balance of sleek and stable, our signature UltraFlask ha