I figured for launching fireworks.
Christopher A. Young Learn more about Jesus
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Looking at the shape of the bottom end it is a one-way path for objects of a narrow size range -- and it looks about right for golf balls, so you push it down on golf balls as you wander the driving range, and they come up the tube and into the bag. Eventually, the bag gets full, and you go to a container, unzip the bag, and pour them into the container -- then go back out for more balls.