- 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.
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.