This is a perfect alternative or spare lid for your standard mouth Hydro Flask.
Hydro Flask says:
From mountain trails to morning yoga class, our Standard Mouth Insulated Sport Cap lets you hydrate one-handed and on the fly. It’s the first insulated sport cap specifically designed to keep water in your Hydro Flask bottle ice cold, sip after sip.
This simple but highly effective insulated, screw top lid is perfect for any Hydro Flask's with a standard mouth design. The simple design still insulates your drinks and the sports cap makes it practical for using it on the move whether commuting or hitting the gym.
- Reviewed by Ultralight Outdoor Gear
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