My father and brother made this video demonstrating how to make a pneumatic tube system for delivering inter office packages and paper work. Now it's been seen over 20,000 times!
It was the first one of it's kind up on YouTube, made in early 2016. Now there are a few more by other people showing off some different methods of doing it. Together with our video there is a great set of videos for making one of your own!
A little time consuming, but anyone can build one for around $100 in materials depending on how long and how strong you need it to be.