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    On a mission to get more people to enjoy the outdoors© 2026
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    Brand: HydraPak

    Category: Running Water Bottles & Flasks

    Recommended by Gavin Prior, Ultra Trail Runner — Boulder USA

    The PocketFlask™ 500ml is the ultimate hydration companion for active individuals, designed to fit seamlessly into your gear while ensuring easy access to your favorite beverages. Its innovative design and lightweight construction make it perfect for those on the go, providing convenience without compromising performance. 1. Compact design that easily fits into snug running belts and slim vest pockets. 2. 28mm locking cap that allows for effortless one-handed operation, preventing leaks during movement. 3. Made from lightweight TPU material, ensuring durability without adding bulk. 4. Pinch-welded bottom for a tapered profile, enhancing comfort and reducing irritation while carrying. 5. 500ml capacity, ideal for hydration during long runs, hikes, or outdoor adventures. 6. Backed by a Beyond Lifetime Guarantee, reflecting the brand's commitment to quality and customer satisfaction. 7. Packs down easily for storage, making it a versatile choice for both daily use and travel. The PocketFlask™ 500ml is designed for runners, hikers, and outdoor enthusiasts who need a reliable hydration solution during their activities. It excels in various environments, from trails to urban settings, and is perfect for both casual joggers and seasoned athletes. Ideal for warm weather outings or extended adventures, this flask ensures you stay hydrated without the hassle of bulky containers.

    Price: $18

    Expert Review

    A cap that is more lock down than PS2

    Recommended by Gavin Prior

    Frequently asked questions

    What does Gavin Prior say about the PocketFlask™ 500ml?

    A cap that is more lock down than PS2

    Why does Gavin Prior recommend HydraPak?

    Gavin Prior recommends the HydraPak PocketFlask™ 500ml for running water bottles & flasks. A cap that is more lock down than PS2

    Is the PocketFlask™ 500ml a good running water bottles & flask?

    Yes — Gavin Prior recommends the PocketFlask™ 500ml by HydraPak as their running water bottles & flasks pick. A cap that is more lock down than PS2

    More from Gavin Prior's Items Gavo Uses Daily

    • Raide LF 5L Running Vest
    • Raide TrailTech Short - Men's
    • Feetures Elite Light Cushion Mini Crew Socks
    • Tifosi Stash Sunglasses Clarion Red Fototec
    Rendezvu
    PocketFlask™ 500ml by HydraPak — recommended by Gavin Prior
    Nutrition & Hydration

    PocketFlask™ 500ml

    Gavin Prior
    Gavin PriorRecommended in “Items Gavo Uses Daily”
    A cap that is more lock down than PS2
    Purchasing through this link directly supports Gavin
    Nutrition & Hydration

    PocketFlask™ 500ml

    Gavin Prior
    Gavin PriorRecommended in “Items Gavo Uses Daily”
    A cap that is more lock down than PS2
    Purchasing through this link directly supports Gavin
    PocketFlask™ 500ml by HydraPak — recommended by Gavin Prior

    This product is for…

    Runners who carry hydration in a vest or waist belt, particularly those who need a flask that collapses as it empties and fits snugly in tight pockets.

    Worth noting…

    The small mouth opening is a real trade-off — hosts flag it as a limitation outside of running-belt use, so it may not suit those who want easy filling or drinking on the go.
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