Seems logical not to do this, but obviously some people are doing it anyway. DO NOT PUT GASOLINE IN A PLASTIC BAG.
Officials say "We know this sounds simple, but when people get desperate they stop thinking clearly. They take risks that can have deadly consequences. If you know someone who is thinking about bringing a container not meant for fuel to get gas, please let them know it's dangerous."
The US Consumer Product Safety Commission is also issuing this stern warning, saying most people are aware of it but sometimes don't think things through when under duress.