Mrb, I'm looking for a quality companion for my time spent in the field. It will accompany you in hot and cold :) However, there are comments that the products of Europe's largest Thermos factory (Ş. Urfa-Yılmazlar), especially the mouth part, are stainless. I request you to explain this technically, not with an advertising tendency. If you're talking about the difference in quality, the only difference for human health is that the negative aspects are eliminated. Real steel doesn't rust. Enjoy your work