Velocity Reservoir

Designed specifically to remedy the awkward fit of traditional hiking bladders in snug trail running vests, this reservoir focuses on low bulk and minimal bounce. Its narrow, ergonomic silhouette slides cleanly into tight vest sleeves and speed packs without creating hard pressure points against your spine. By stripping away rigid structural plastic and utilizing a pliable top slider, it cuts weight down to a bare minimum while maintaining a shape that refuses to balloon out when fully filled.

Constructed from durable thermoplastic polyurethane with radio-frequency welded seams, the reservoir withstands aggressive compression and freezing temperatures. The Slide-Seal closure opens wide for quick refills at aid stations and seals tight against leaks under pressure. Water delivery is handled via a flexible hose and high-flow bite valve with a twist shut-off, while a quick-disconnect port lets you untether the bladder from the hose without draining fluid into your pack.

Cleaning and drying remain standard HydraPak fare: the entire body can be turned completely inside out, eliminating the mildew risks common to narrow-mouth screw-top systems. The trade-off for this stripped-down, vest-friendly design is capacity and rigidity. It lacks the internal support or external hang loops seen on heavier hiking reservoirs, meaning it will sag toward the bottom of unstructured packs as it empties. For runners, fastpackers, and endurance racers prioritizing low weight and a locked-down ride, it hits the sweet spot.