Scott Jurek designed the UD SJ Ultra Vest to be the perfect all-around product for everyday use or high-end racing. Comfort and performance are outstanding due to it's technically advanced design and features.
The SJ Ultra Vest 2.0 adjusts to fit a wider size range with the addition of side adjustment straps. SJ Vest 2.0 is also stronger and more durable with a 340gm Power Mesh, Silnylon 66 for increased seam strength, and all pockets have been reinforced with edge banding for better gear retention. An added size zipper improves access to an optional reservoir.
Scott Jurek really understands what runners need, and that is exactly what he designed.
"I’ve been using Ultimate Direction packs for years, modifying them to carry bottles in front…the Ultra Vest is the culmination.”
Scott Jurek
FEATURES (FRONT)
- Smart Phone compatible pouches (2)
- Bottle holsters tighten to carry camera, etc.
- Gel or bar pouches (4)
- Electrolyte or valuables pockets (2)
- Fully adjustable sternum straps (2)
- Emergency whistle
- Super soft VelvetexTM no-chafe binding
FEATURES (BACK)
- Micro adjustment straps for better fit (2)
- Quick reservoir access zipper
- Internal bungee to secure gear or reservoir
- Secure lat pockets, with stretch panel behind (2)
- Two zippered compartments
- Trekking pole (2) and Ice Axe (1) loops
- Extra tall mesh pocket to keep items secure
SPECIFICATIONS
Volume Capacity: 427 in3 / 7L
Fluid Capacity: 2 x 20 oz bottles / 2 x 591 mL (plus optional reservoir)
Weight: 11 oz. (16.5 oz. with bottles) / 310 g (468 g with bottles)
Height: 12 in. / 30 cm
Width: 9 in. / 23 cm
Depth: 2.5 in. / 6 cm
SIZING AT CHEST (UNISEX)
SM: 23 - 33 in. / 58 - 84 cm
MD: 31 - 39 in. / 79 - 99 cm
LG: 36 - 44 in. / 91 - 112 cm
Notes:
- New adjustment straps fine tune the fit
- Measure wearing the clothes you intend to wear
- A vest full of gear will fit smaller
MATERIALS & DESIGN
Silnylon 66: Impregnating nylon with Silicon and Polyurethane creates this permanently waterproof fabric, and also substantially increases its seam and tear strength.
Hex Mesh: The Hex Mesh vest structure is completely breathable, extremely strong, and lightweight. Its inability to absorb moisture results in a drier, more comfortable wear.
Power Mesh: All pockets are strong and stretchy, made with heavy duty 340gm Power Mesh stretch fabric so the vest expands as you need it to.
Keywords: SJ Vest 2.0, Hydration packs for ultra runners, ultra running hydration packs, ultra runner hydration packs, best ultramarathon hydration packs, Signature Series Scott Jurek ultra vest, UD SJ Ultra Vest
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Overall a great ultra vest 
Works for me 