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Packing both a rear 70 oz (2L) reservoir and an ergonomic front 18 oz flask, the Nathan Zelos is designed for serious mileage and serious comfort. The Zelos totes hydration, apparel and accessories comfortably via the 3-Way Propulsion Harness, allowing this vest to move naturally with your body as you run. Several front pockets give easy-access to nutrition and essentials, and a rear shock cord let's you stash lightweight apparel.


  • Nathan Grey (5030NG)


Vest Details

  • 70 oz (2L) Hydrapak® Slideseal bladder included
  • Includes 18 oz SpeedDraw flask with soft silicone nozzle
  • 3-Way Propulsion Harness™ moves with your shoulders and upper torso: each shoulder strap moves independently, preventing pack from swaying or riding up, provides freedom of movement
  • Fully adjustable, including vertical sliding sternum strap and side straps
  • Wall Mesh construction is lightweight and breathable, with soft perimeter binding
  • Contoured, padded back panel for comfortable, snug fit
  • Zipper pocket offers quick access to bladder for re-filling
  • Large rear zipper compartment for stashing essentials, includes key hanger
  • Expandable front Power Stretch Mesh zipper pocket for nutrition, headlamp, phone or small accessories
  • Small water-resistant velcro pocket for electrolyte capsules or tablets
  • Front power stretch pocket for 18 oz Speed Flask, or other accessories
  • Open front pocket stores additional bottle, nutrition or small accessories
  • Rear shock cord and one-pull tension lock carries jacket or other apparel
  • Tube clip at chest closure and tube guides
  • Safety whistle attached at front chest
  • Torso Length: 15.5 inches (39.4 cm)
  • Weight: 18.0 oz (510.3g) with empty bladder & bottle
  • Pack Volume: 7.1L (433 inches³)

Bladder Details

  • Hydrapak 2 liter Hydration Bladder
  • Unique Slideseal™ allows for easy filling, cleaning and drying
  • Durable Thermoplastic Polyurethane (TPU) construction
  • BPA and PVC free, will not taint water taste
  • Anti-Microbial additive helps keep bladder clean
  • Dishwasher safe bladder
  • Omnidirectional high flow bite valve
  • Durable, kink resistant drink tube
  • Fill scale helps you monitor fluid volume
  • Tube can be cut to desired length, simply remove the bite valve and cut with sharp scissors
  • Hose is removable from bladder

Flask Details

  • Easy-squeeze, ergonomic 18 oz Nathan SpeedDraw flask
  • 25% bigger, soft silicone nozzle is easy on your teeth, keeps shape and doesn't leak
  • Delivers high flow rate of liquid with little effort
  • Soft grip cap is easy to open, even with wet hands
  • BPA-free and won't leech plastic taste
  • Bottle and cap are dishwasher safe on top rack


  • 80% Nylon / 20% Polyester

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Customer Reviews

Comments: This pack replaced my Nathan HPL #020 2L race vest, which I wore for over four years. It has more storage for nutrition and a shirt, or light jacket. I can also store a head lamp, keys, and other small essentials. I get lots of utility and lots of value from the price.
From: Frank R., Virginia Beach, VA, USA. February 24th 2016

Comments: Ordered the Zelos based upon need and my body size. This pack is ideal for 'bigger' runners, I am 5'11 fluctuate b/t 190-200 lbs. run handful of ultras, I needed a bigger pack. I rotate this one with older CB Marathoner pack. Pros-this pack is extremely light; easy to adjust; front pockets will carry 8-24 ounce water bottles-I like the straight up and down; and back pocket with zipper is great for keys, other stuff. Cons-the bladder is poor-cumbersome to refill, and bite valve does give me enough-CB is simply the best; the adjustment straps are good; however, location of tieback can bother arm swing-I had to adjust to good spot for me. I have run long runs in this and ran a marathon with this pack. I will be using it again in an upcoming 50 K. For the money, if you are a bigger runner-seriously look at the Zelos.
From: Dave, Orlando, FL, USA. December 2nd 2015