From Ozgal7
A couple years ago we had to throw out an empty, unused camping fuel container at check-in. Not sure if there would be a different logic for allowing/disallowing a metal water bottle.
Originally Posted by
YCTTSFM
Ozgal, your camping-fuel container was disallowed because of the flammable vapors, not the steel container. This rule far predates 9/11. I remember having to find destination vendors who stocked containers that fit my backpacking stove by phone and fax, back before the internet....

Sorry, empty and unused should pass the sniff test. TSA is out of control.