ditto....i have and use that same one........and the same TC U-view(think thats what they are called) flask as well......i like being able to see my powder....can tell if somehow it got moister in it.....see how much is left....just make sure its ok and call goes down the tube.....and i think brass ones would make noise...not sure but a few metal objects in a possibles bag would probably clank around........i havent had a problem in...3 years? with mine