Part of our ultra-light series, the 500ML is so light, you might forget you brought it. Weighing in at just over an ounce, it’s optimal hydration, no matter what kind of runner your are. Its liable material conforms to most pockets, it shrinks as you drink to minimize water movement and it can be used with or without the tube. Ultra light weight, ultra useful.

1 in stock

0 out of 5
Item will be shipped in 1-2 weeks



  • A great hydration addition or replacement to your running vest, pack or belt pocket
  • Vest-pack fit provides bounce-free stability and a flexible flask shoulder to prevent chafing so you can focus on FKT’s and PR’s
  • High-flow bite valve auto-seals after each sup, eliminating annoying drips
  • Large standard 42M opening lets you fill the UltraFlask easily with ice and drink mixes
  • Customize your cap with 2 options depending on your run or vest, directly mount your bite valve or use the straw cap (4IN / 100MM)  
  • Made of ultra-durable, abrasion resistant TPU and RF welded seams for superior durability and elasticity
  • 100% BPA and PVC free, wide working temperature range (can be frozen – max temp 60°C / 140°F)