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Store > Shop By Brand > Ultimate Direction > Ultimate Direction SJ Ultra Vest

Ultimate Direction SJ Ultra Vest

Regular price $124.95
Sale price $49.95


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Note: Size small is very small. 31 inches is the upper end of the scale for the chest measurement.

The next generation of hydration systems... designed by athletes for athletes.

"I've been using Ultimate Direction packs for years - modifying them to carry bottles in front... the Ultra Vest is the culmination." -- Scott Jurek

The SJ Ultra Vest is the result of collaboration with Scott Jurek, the world's most dominant ultra runner. Weighing 7.5 ounces (11.5 with bottles) and offering 9.2 L of storage space, the SJ has the best weight-to-capacity ratio of any hydration pack on the market.

The Signature Series was designed by three of the most successful, most well-known ultra runners in the world. Using power mesh for zero bounce and state-of-the art cuben fiber for its unsurpassed strength to weight ratio, our Signature Series vests integrate load carrying, performance, and comfort into one unified system. With water bottle pockets in the front of the vest for quick and easy access, the Signature Series represents the next generation of ultra running hydration packs for runners.

Specs & Details

Sizing At Chest (Unisex):

  • Small: 25 - 31 in. / 63.5 - 78.7 cm
  • Medium: 31 - 38 in. / 78.7 - 96.5 cm
  • Large: 38 - 43 in. / 96.5 - 109.2 cm

Learn How to Fit Your UD Vest


  • Volume Capacity: 47 in./ 9.2L
  • Fluid Capacity: 2 x 20 oz. bottles / 2 x 591 mL
  • Weight: 7.5 oz. (13 oz. with bottles) / 212 g (368 g with bottles)
  • Height: 12 in. / 30 cm
  • Width: 9 in. / 23 cm
  • Depth: 2.5 in. / 6 cm

Features (Front):

  • Smart phone compatible pouches (2)
  • Bottle holsters tighten to carry camera, ect.
  • Gel or bar pouches (4) 
  • Pocket for electrolytes or valuables (2)
  • Adjustable sternum straps (2)
  • Emergency whistle
Features (Back):
  • Cuben Fiber bellows for large or small loads
  • Secure lat pockets, with full pocket behind (2)
  • Two sizes main compartments
  • Hex Mesh for maximum breathability
  • Trekking pole (2) and ice axe loop (1)


  • Cuben Fiber: Used for the sails of America's Cup racing yachts, this non-woven fabric is 15 times stronger than steel and 40% stronger than Aramid fibers, and is extremely resistant to moisture, UV, and chemicals.
  • Hex Mesh: The vest is breathable, strong, lightweight, and moisture resistant.
  • Power Mesh: All pockets and super stretchy, so small loads won't bounce and the vest expands as you need it to.

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