- How wide is the opening of the pouch?
- The diameter of the Shake It Out and Fitness Flask spout is an inch and a quarter.
- How do you clean the SHAKE It OUT® or Fitness Flask?
- Can be cleaned as you would clean other water bottles. It's reusable (many times over) and recyclable. Clean if you like, recycle if you not. Crazy convenient.
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Does this container have a "flat" bottom -- i.e., can it stand up on its own when filling?
- When you fill it it spreads out on bottom and stands up. It auto collapses when it has nothing in it.