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On Running
Ultra Vest 5L

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Color:Undyed White



Why We Like The On Ultra Vest 5L

With the On Ultra Vest 5L on our body, staying hydrated during our short to medium-distance trail run is easier than ever. The built-in hydration system features two 500ml Hydrapak flasks on each side of our chest for quick access, while a variety of pockets store our smaller items such as gels, keys, and other essentials.


  • A minimalistic 5L vest for short to middle-distance trail runners
  • Made with breathable mesh material for a comfortable, secure fit
  • Patented-pending closure system allows for precise placement adjustments
  • The use of non-stretch materials nearly eliminates bottle bounce
  • Two 500ml Hydrapak flasks keep hydration easily within reach
  • Strategically placed daisy chain loops attach a quiver bag, poles, etc.
  • Item #ONFB09O
Responsible Collection
[main] 85% recycled nylon, 15% elastane, [pockets] 41% nylon, 41% recycled nylon, 18% elastane
trail running, road running
Manufacturer Warranty

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