Harry Eng the Master Bottle Filler.

Harry was born in 1932 and died in 1996. He was a school teacher, educational consultant, inventor, and magician. A web search will tell you a little about his many talents but in summary:

Everything he did was intended to teach you to think.

Here are some of his bottles that are in the Puzzle Museum.

This bottle contains his "Trademark" knot. It is, as always, too large to come out of the bottle, but also the stick plus cord is too wide for the neck of the bottle.