Resealable bag

For Disconnect" at Victory Gardens, I needed a cheap disposible bag of party whistles to be easily resealable.

 To do this I used the original bag and cardboard header from the whistles, a bit of magnet and some metal plumber's strap.

I glued the plumbers strap inside the cardboard, and then the bag on top of that. The magnet glued to the other side is strong enough to hold the cardboard closed through the two thin layers of plastic bag.
As a bonus, this rig added some weight to the bag, which helped the actors to toss it across the stage like they needed to.