Soft material conforms to most hydration vests, belts, or pack pockets, makes a great addition or replacement running flask
- Flexible design shrinks as you drink reducing water movement
- Includes two cap sets: one with a removable bite valve mounted directly to the cap and one with an adjustable drink tube that be cut to a custom length
- Vest-pack fit provides bounce-free stability and a flexible flask shoulder to prevent chafing so you can focus on FKTs and PRs
- High-flow bite valve auto-seals after each sip, eliminating annoying drips
- Large 42mm opening lets you fill the UltraFlask easily with ice and drink mixes
- Made of ultra-durable, abrasion resistant RPU & RF welded seams for superior durability and elasticity
- Can be frozen or filled with hot water (max temp 60C / 140F)
- Top-rack dishwasher safe
- Safe and reliable, 100% BPA & PVC free
