Ultraspire Zygos Unisex Lightweight Hydration Pack – 2L Reservoir, Pitch Black, Size Small

Meet the Zygos: a lightweight hydration pack built for speed and stamina

The Ultraspire Zygos is designed for runners who want a lightweight, comfortable pack that moves with them. Every detail aims to support natural movement, precise contact, and balanced weight distribution so you barely notice the pack while you push your pace.

Key design elements include Ergofit, a system that mirrors body mechanics to minimize inhibition and maximize freedom of movement. The main back compartment is reinforced with XT fabric and a robust ripstop weave, giving durability where it matters most. You get a removable insulated bladder compartment made of Mylar to reflect and trap temperatures, helping fluids stay at the temperature you prefer over long sessions.

Insulated bladder and temperature control

The insulated bladder compartment is designed to help fluids stay hot or cold, so you can sip with less concern about sudden temperature shifts as you move from shade to sun, or from early morning chill to afternoon heat.

Storage that keeps your essentials accessible

• Two zippered shoulder pockets for quick items
• Two 4-way stretch mesh pockets for versatile storage
• A pair of stretch mesh pockets, one zippered for a large phone
• A zippered side pocket for small gear
• A magnetically closed side pocket for easy access

On the go, you’ll appreciate eight pockets in total that keep snacks, phones, and layers within reach without slowing your stride. In addition, UltraFlask compatible bottles and other hydration options slide into the pack for flexible hydration choices.

Secure fit without restricting breathing

MAX02 sternum cord acts as a shock cord that stabilizes the load while allowing expansion for breathability. The result is a snug, natural feel whether the pack is empty or fully loaded, so you can maintain form over miles.

Whether you are chasing a tempo run, a long trail session, or a day of big miles, the Zygos offers a compact profile with careful attention to comfort, temperature management, and accessible storage. It is a unisex, lightweight choice that can adapt to a range of body sizes and running styles, with a 2L reservoir included to support longer outings. Color is pitch black for low visibility and stealth under low light, making it a versatile partner for road, trail, and mixed terrain use.