Ultraspire Zygos Unisex Lightweight Hydration Pack - 2L Reservoir, Pitch Black, Large

Ride with confidence on every trail

Meet Ultraspire Zygos, a unisex lightweight hydration pack engineered for ultra running and long days on dirt or pavement. The design blends precise movement with thoughtful storage, so you can focus on pace and terrain while the pack hums along with you. This is not about a single feature, but a cohesive system built to support endurance without getting in the way.

Designed to move with you

ErgoFit is more than a label. It targets contact points and weight distribution to preserve your natural biomechanics. The result is a comfortable, low-profile silhouette that stays close to your body from start to finish, helping you maintain balance on uneven ground.

Keep fluids at the right temperature

The insulated bladder compartment, crafted with a Mylar layer, reflects and traps temperatures to help fluids stay near your preferred temperature longer. The pack includes a 2-liter reservoir that sits within the removable insulated pocket, making sips on the fly quick and simple.

Durable, organized storage

The reinforced main back compartment uses XT fabric with strong ripstop fibers, delivering durability for countless miles. A total of eight pockets offer flexible storage for bottles, gels, phones, and small essentials, while maintaining a lightweight feel for fast days.

• On-the-go pockets include two zippered shoulder pockets, a dual 4-way stretch mesh pocket, a pair of stretch mesh pockets (one zippered for large phones), a zippered side pocket, and a magnetically closed side pocket.
• Compatible with UltraFlask, Formula 250, Human 20 oz 2.0, or a collapsible bottle (not included).

Secure, comfortable stability

The MAX02 sternum system uses a shock cord for 100% rebound and outward stretch, keeping the pack snug against your torso whether empty or fully loaded, while preserving a natural breathing pattern.

Real-world use and benefits

Ideal for long-distance trail runs, ultramarathons, early morning sessions, or hot days when hydration access matters. The Zygos is designed to support an efficient stride and easy retrieval of essentials, making it a practical option for runners who value combination of movement and access.