Capri Sun Garbage Can

I have this very small garbage can in my car, the kind that was made to go in a car.   It is way to small to keep up with the trash that my 2 kids produce.  So I made this Capri Sun juice pouch bag today to be my car trash can.  I just need to tape down the garbage bag so that the kids will always get the trash in the bag and not in the bottom of the "can."  It is large enough to hold a kitchen sized garbage bag, which is perfect for our needs.