File:US Navy 030327-N-1290G-003 Plane Captains take a relax and play some "hackey-sack", on the flight deck aboard the aircraft carrier USS Harry S. Truman.jpg - Wikimedia Commons
Special Hobby 1/72 Sack AS-6, by Ryan Grosswiler
Plane Sacks - Lee Valley Tools
Plane Sacks - Lee Valley Tools
Special Hobby 1/72 Sack AS-6, by Ryan Grosswiler
Sack Ups Plane Sack - Jack Plane SU546 - Classic Hand Tools Limited