^^^ Indeed. A standardized shape that is 80-something years-old and you will almost certainly be able to continue purchasing them for decades to come?.. Hard to beat.
:safari-rig:
And since no one just goes on vacation anymore (it's an expedition, right?) your jerrycan carrier will hold your luggage, too...
:coffeedrink:
Just kidding, of course!
I think we need a link to these as well