UltrAspire Purist Hydration Pack

• Running-vest harness: Body-wrapping front construction distributes storage and weight around the torso.
• Challenge Cloth: Three-layer composite combining high-density polyester, UHMWPE fibre reinforcement and polyurethane film for high abrasion resistance at relatively low weight.
• EnduraMesh XT: Four-way stretch mesh combining Nylon 66 with 30% UHMWPE fibres for flexible, abrasion-resistant storage.
• Roll-top main compartment: Adjustable closure accommodates changing equipment volumes and allows additional capacity when needed.
• Side compression system: Roll-top fastenings compress the main load and help retain items in the side pockets.
• Rear quick-stash pocket: Large four-way stretch external storage with compression straps.
• Rear hydration sleeve: Externally accessible, insulated compartment accommodates up to a 2 litre reservoir.
• Large side pockets: Two four-way stretch pockets each accommodate bottles or soft flasks up to 1 litre.
• Movable aluminium toggles: Two repositionable attachments provide alternative trekking pole or ice axe carrying positions.
• MaxO2 waist system: Stretchable adjustment accommodates changes in carried volume and weight.
• Adjustable sternum straps: Two straps with vertical daisy-chain positioning and aluminium toggle fastenings.
• Upper harness pockets: Two zipped pockets with sweat-resistant lining for a GPS tracker, SPOT device or smaller valuables.
• Front hydration pockets: Two zipped, sweat-resistant lined pockets securely accommodate soft flasks up to 800ml.
• Hydration ports: Openings allow bite valves or drinking straws to extend from the zipped flask pockets.
• Multifunction front bungees: Retain hydration tubes or provide horizontal carrying options for folded Z-poles.
• Outer harness pockets: Two large accessible pockets with bungee retention for hydration, food or equipment.
• Side zipped pockets: Two smaller pockets for food, wrappers and other essentials.
• Breathable air mesh: Used across the inner harness and back panel.
• Safety whistle: Located at the top of the front harness.

For information about UltrAspire running vests and hydration packs, see our UltrAspire pack guide.

If you are deciding how much carrying capacity you need, see our Running Backpacks, Race Vests & Hydration Packs Guide. Capacity should be considered alongside mandatory kit, aid-point spacing, water availability, weather, pace, access to crew and your preferred carrying strategy, rather than race distance alone.

If you are unsure about sizing, hydration setup or whether the Purist provides the right capacity for your ultra-running kit, get in touch for straightforward advice.