Is a 1 liter empty stainless steel water bottle allowed to be carried through the security checkpoint?
I've just read this question (and gave a look at the answers) which is only about plastic. The word metal does not appear on the page, nor stain or steel do.
My travel is Pisa(Italy)-Doha-Singapore (and then vice-versa) operated by Qatar Airways.
The bottle in question is very very important to me, also because it is very very expensive. The reason I'd like to carry it with me in the cabin is that I don't want it to be "harmed" during baggage load and/or unload.