Nathan Soft Flask With Bite Top

Built as the perfect companion for hydration vests and packs, the Soft Flask with ExoSpine™ 18oz is a large-capacity soft flask designed to fit in front vest pockets or as an extra in back storage. The classic bite valve gives you control over flow so liquids go where you want them, not down your chest.

Fully compatible with all Nathan hydration vests, this is the go-to flask for marathon, trail, and ultra runners who need a reliable add-on.

• Flask features Nathan's ExoSpine™ for structure and stability
• Bite valve features high flow domed post and blaster compression system that control the water distribution when you use it.
• Max Fill design with wide flange and 3D bottom shape for more volume in shorter dimension
• Flexible design shrinks as you drink reducing the movement and easily packs away when empty.
• Works great with all NATHAN® hydration vests, packs, and wide compression belts
• Capacity: 18oz/532mL