You do realize the new cans prevent vapors excaping which is what would explode. Yes they swell and collapse with heat changes. But i have never had one leak.New fuel pour spouts are pure bull leavings , a royal pain in the back side. Ridiculous prices for blow molded chicom plastic. every one i have had has always leaked where you screw the spout on. And I just love it when they swell up and roll over and of course leak at the spout container junction. ( it doesn't take a lot of temp change to accomplish this either)sooner or later someone is going to go out flip a light switch on and have the whole place go boom. Likely has already happened.
Yes I have had some cheap ones collapse due to temp drop vs fill time also.