evo.com | Patagonia Hydration Packs > With a low profile and breathable, body-hugging shoulder and waist straps, the Patagonia Dirt Roamer 20L Hydration Pack is the perfect mountain biking companion. With a top compression strap that doubles as a helmet carry, an included 2-liter HydraPak(R) Shape-loc reservoir, and the durable, sustainable construction we've all come to expect from Patagonia. S/M 20.8" x 10" x 5.9" | 15L (915 cu in) Body 4.7-oz 210-denier 100% recycled nylon plain weave with a PU coating and a PFC-free DWR finish (durable water repellent coating that does not contain perfluorinated chemicals) Comfortable Shoulder & Hip Straps Highly breathable Regulator(R) air mesh through the hip belt and shoulder straps to maximize breathability. Breathable Mesh Back Panel Raised mon-mesh back panel increases breathability and does not absorb water. Hydration Reservoir 2L HydraPak(R) Shape-loc | Patagonia Dirt Roamer 20L Hydration Pack 2026 - Small in Black | Nylon