- Ideal size for all-day hydration
- Fits most backcountry water filters
- TempShield Protected
- Keeps cold up to 24 hours
- Keeps hot up to 6 hours
- 18/8 Pro Grade Stainless Steel
Replacing the existing cap on all of Hydro Flask's Wide Mouth bottles, the new award-winning Flex Cap is the ideal combination of strength and flexibility. Designed for ultimate portability, every detail was crafted with easy-carry comfort in mind. This cap is even insulated, so you can go further, for longer, keeping your favorite beverage comfortably by your side.