[header] How to make a plastic bag explode [title] Select your bag. [step] You can use any plastic bag for this experiment. The preferred method is to use a resealable bag so that you don't have any air leaks. 
This will effectively build the pressure inside the bag, eventually causing it to explode. [substeps] You can use other bags and tie them shut, but this can lead to air leaks that bleed off pressure and prevent your bag from exploding.