The perfect companion for any walk or run so you can stay cool and hydrated. This large-capacity 18oz. soft flask fits great in front hydration vest pockets, or as an extra in the back storage or stash pocket. With the bite top, you can make sure that you have control of where your water or liquids go – straight into your mouth and not dripping out the top. The best big-time insulation for a big-time thirst!

CLASSIC DESIGN
Our timeless bite valve helps liquids from escaping so you can keep yourself hydrated no matter how far you go.

SIMPLY COMPATIBLE
Your 18oz. Soft Flask with Bite top is perfectly compatible with ALL Nathan hydration vests.

Features
Insulated properties keep fluids cooler 38% longer than non-insulated soft flasks
Flask features Nathan's Exo-Spine 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