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UltrAspire Zygos 854L Hydration Vest
Sale $127.96$159.95 20% Off

Item # ULA001A

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Item # ULA001A


Make short work of long days.

UltrAspire describes the Zygos Hydration Vest as, "the most human-compatible vest system ever built," which is pretty sweet, even if describing it as "human-compatible" makes it seem like most other vests were designed to be worn by robots or dogs. What UltrAspire is trying to say is that Zygos is one of the most ergonomic, comfortable, and thoughtfully designed large-volume hydration packs out there, perfect for hiking, biking, and long-distance running. It sits on your back incredibly comfortably, thanks to the breathable and highly elastic Max 02 sternum strap, compression straps, and comfortable wrap-around hip belt. Once it's snug, the straps won't loosen up on you, while the nylon and mesh construction will help you stay cool during high-output activities. Like any good hydration pack, the Zygos has both a hanging 2L reservoir and dual front bottle holsters, along with a multitude of stash pockets on the front, sides, and back to keep your snacks, gels, and other key gear handy.

  • Ripstop nylon and mesh construction
  • Hanging hydration sleeve with 2L bladder
  • Max 02 sternum strap
  • Compression straps
  • Shoulder strap pockets
  • Hip belt pockets
  • Back stash pocket
  • Bottle holsters
  • Soft edges

Tech Specs

30D nylon ripstop, mesh
14L (854cu in)
Waist Belt:
Hydration Compatible:
Reservoir Included:
yes, 2L
2 hip belt, 2 shoulder strap, 2 front bottle holsters, 1 internal security, 1 back stash
Recommended Use:
running, hiking, biking
Manufacturer Warranty:
limited lifetime

Size Chart


Hydration Vests
Chest 28 - 42in
(71 - 107cm)
36 - 46in
(91 - 117cm)
Torso Length 16 - 20in
(41 - 51cm)
18 - 24in
(46 - 61cm)
Chest 28 - 44in
(71 - 112cm)
32 - 50in
(81 - 127cm)
Torso Length 16 - 20in
(41 - 51cm)
20 - 24in
(51 - 61cm)
Waist 26 - 40in
(66 - 102cm)
30 - 42in
(76 - 107cm)
Alpha 2.0
Chest 26 - 35in
(66 - 89cm)
32 - 38in
(81.3 - 96.5cm)
38 - 46in
(96.5 - 116.8cm)
How to Measure:
For best results, take measurements over your underwear.
Measure the circumference around the fullest part of your chest.
Torso Length:
Measure from the top of one shoulder down the center of your back to the point at the same level of your hip bones.
Measure the circumference around the point at which your body bends when you lean to a side (typically near your navel).

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