Not just any cooler, we have added magnets and a velcro strip.
Why magnets? Well, for the times when you are standing around your 4WD with a coldy and no where to put it down, just the stubby cooler against the steel. Our embedded magnets are covered with a non-marking cloth.
The velcro allows you to glue one part of the velcro securely in place so you can keep them handy for when the are needed.