One of the comments posted on that site:
Awesome. Please don’t do that again (I’m a pilot and I don’t want to run into your contraption in the air). Very cool, regardless.
The 'Disclaimer' is also interesting:
***CAUTION/DISCLAIMER: Launching things into the stratosphere can be DANGEROUS! Please contact the FAA before trying any launches (even if they are under 4 lbs.) to make sure your vehicle won’t be entering restricted airspace and PLEASE check the University of Wyoming’s Balloon Trajectory Predictor(or a similar website) to make sure you balloon won’t be landing in the city/a populated area where it might cause significant damage. Also, be sure to test your balloon’s terminal velocity for descent before launching. We tested our parachute by putting eggs inside of our styrofoam box and tossing the box off of a 5 story building. We were not satisfied with the landing speed of our box until the eggs did not break upon the box’s impact.