Secret Tennis Ball Compartment

In this Instructable I will teach you how to make a tennis ball compartment. For this all you will need is a tennis ball and a serated and pointy knife.

All you do is find the longest stretch of straight white line on the ball and saw along the line after a while stab your knife through the white line and saw down the straight line.

To open it you have to put you thumb and your index finger either side of where you cut and squeeze as I am doing in the photo.