This style of gas can is remarkably tough. You see them sliding out of pickup trucks and bouncing down a gravel road. In a previous job, I'd see the remains of black bears trying to get into them. Just a couple bite marks where their teeth penetrated the plastic. Some big gouges into the plastic from the claws that didn't penetrate.
In an accident, I'd be more worried with the wing tanks being ripped open.
In Canada, there's a "Limited Access" provision in our Dangerous Goods Regulations that allow up to 230L (60.8gal) of gasoline/diesel/jetA to be carried in this style of container on commercial aircraft with passengers. It's only allowed if the destination does not have the available resources that you require. Eg. remote aerodromes, such as your trip.