The Altruist Hydration Pack is engineered for multisport athletes and mountain runners who require greater capacity, stability, and all-day comfort when carrying heavier loads. With a 28-liter capacity and roll-top closure, the Altruist is built for extended efforts where preparation, reliability, and efficient organization are essential. Massive side pockets provide quick access to essentials and are compatible with UltrAspire hydration components, while a quick-stash outer pocket with integrated load compression keeps gear secure and manageable on the move. The pack is reservoir-compatible for seamless hydration across long distances and varied terrain. Designed for stability under load, the Altruist features a supportive waist belt that helps leverage weight distribution when the pack is at capacity, creating a more comfortable ride over long miles. Removable anodized aluminum buckles offer durable attachment points for trekking poles, ice axes, or sleeping pads, ensuring adaptability across disciplines and conditions. The harness system includes adjustable webbing with a sliding toggle for a secure, dialed fit. Up front, large zippered bottle pockets provide weather protection, while layered zippered storage keeps nutrition and essentials within easy reach. Sweat-resistant phone storage and dual zippered top shoulder pockets add organization without interrupting movement.

Constructed with EnduraMesh XT, the Altruist features a true 4-way stretch mesh that moves naturally with the body while maintaining structural integrity under load. Unlike conventional stretch materials that fatigue and lose shape over time, EnduraMesh XT blends high-strength Nylon 66 with 30% UHMWPE fibers — a material rated up to 15 times stronger than steel by weight. This advanced composition delivers adaptive storage that expands when needed, secures gear without sagging, and withstands abrasion from repeated use in harsh environments, preserving both durability and a streamlined fit.

Built for athletes who carry more so they can go farther, the Altruist delivers dependable performance, balanced load management, and the confidence to stay self-sufficient in demanding environments. Available in SM/MD & MD/LG.