Round coolers, by law, are only orange (though once in a great while they are allowed to be yellow).
Where in the heck did that come from???
I don't believe it, for a second.
Mine's red.
I've seen blue, green, black, white, brown, yellow, orange...I can't imagine there's a color mandate.
I can see maybe a rule within an organization like OSHA, but not a Federal mandate for regular consumers.