Hi sir, this is a spout pouch for water or juices.
With a flip-top cap spout, it's very convenient for drinking.
You can see there is an aluminum carabiner on the top corner of the pouch, which makes the bag easier to take out.
So it will be a nice choice to take it when people have a hike or play sports outside.
Also, what's the biggest difference between the bottles?
The pouch can be pressed after being emptied, has a very small volume, and is easy to put into the bag.
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