Purist Hydration Pack

The Purist is part of our Pure Mountain Running line, created for athletes who move through environments where gear is continuously tested by terrain. The primary body of the pack is constructed using challenge cloth, a three-layer composite that pairs high-density polyester with a UHMWPE fiber reinforcement layer and a polyurethane film. This creates a fabric that is significantly more abrasion resistant than even military spec fabrics, while remaining exceptionally lightweight and ready to handle sharp rock, brush, and the constant friction of long days in the mountains. Complementing this is our EnduraMesh XT, a true 4-way stretch mesh that flexes naturally with the body. Unlike typical stretch meshes that degrade under stress, EnduraMesh XT blends Nylon 66 for strength with 30% UHMWPE fibers that are rated up to 15 times stronger than steel. The result is a pack that delivers both adaptability and long-term durability, built to move with you while standing up to whatever the mountain throws your way. Recommended Use: The Purist is designed for multisport athletes and endurance adventurers who need a versatile, high-capacity pack built to handle everything. Ideal for ultrarunning, adventure racing, mountaineering, and long backcountry adventures where carrying a variety of gear is essential. Perfect for athletes who demand fast access, durable construction, and all-day comfort across unpredictable terrain and changing conditions. Details: • 22-liter roll-top design built for multisport and endurance athletes • Durable construction with premium materials for rugged, all-condition use • Massive side pockets fit all UltrAspire hydration options and allow fast gear access • Accessible, insulated reservoir sleeve for efficient mid-effort refills • Large quick-stash outer pocket with compression for secure load management • Anodized aluminum buckles provide reliable attachment for poles, ice axe, or hose management • MaxO2 sternum system with adjustable toggle buckle for custom fit and breathability • Front harness includes a zippered bottle pocket with weather protection • Layered zippered pocket at the fingertips for quick-access items • Sweat-proof lined phone pocket keeps electronics protected • Dual zippered top shoulder pockets for additional organization Specifications Fit: Universal Sizes: 26″–45″ Color: Black Hydration Included: Not Included Bottle Compatible: UltraFlask 550 Hybrid Bottle, Softflask 300/500/800, Human 20 Bottle, Reservoir Capacity: 1343 cu in (22L) Weight: 1 lb 5 oz (595g) PURIST CAPACITY & DIMENSIONS Main Compartment Capacity: Approx. 18L Total Pack Capacity: 22L Main Compartment Dimensions (fully loaded): 50 cm tall 20 cm wide 17 cm deep Exterior Storage: Front side pockets: Approx. 1L each Rear bottle pockets: Approx. 1L each Rear stow pocket: Approx. 1L depending on main compartment load