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2018 Road Bike Buyer’s Guide

UltrAspire Zygos 2.0 Hydration Pack

Temporarily Out Of Stock

Item # ULA001Q

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From 50k to 100k.

Built for fast-packing and ultra runs alike, the UltrAspire Zygos 2.0 Hydration Pack provides ample storage space for necessities and fuel as you tackle varied, fun-type-two terrain. The Zygos 2.0 is a unisex vest, complete with lightweight and breathable mesh material that's reinforced by a silicone or PU coating for added water-resistance and durability. Unique to UltrAspire is the Max O2 Sternum strap, which is designed to promote unencumbered breathing and stability—without sacrificing durability or comfort. 

Additionally, the Zygos easily accommodates a two liter reservoir (which is included) for on-the-go hydration, while the front pockets are compatible with UltrAspire's UltraFlask, Formula 250, Human 20, or the Collapsible Bottle (none of which are included) to meet your hydration needs. A bevy of pockets keep necessities, such as fuel tabs, keys, or a phone secure, and the adjustable rear straps offer safe respite for items such as a trekking pole, ice axe, or extra layers. 

  • A unisex hydration vest for 50k+ length runs
  • Mesh is reinforced by silicone and PU coating
  • Bevy of pockets keep necessities close
  • Sternum straps assure unencumbered breathing
  • Comes with 2-liter reservoir and magnetic clip
  • Front pocket is compatible with UltrAspire water bottles

Tech Specs

mesh, nylon, PU coating, silicone coating
Hydration Compatible:
Reservoir Included:
yes, 2-liter
[front] 2 flask, 2 drop-in stretch, 1 magnetic, 1 zipper, [back] 2 zippered (1 located on bottom)
Trekking Pole Carry:
9 x 3.5 x 13.5in
Claimed Weight:
Recommended Use:
trail running, road running
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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