Review on Revolutionary Wine Ziz Stainless: Mess-Free & Leak-Proof Solution by Chris Castro

All stainless steel, including funnel. You must pour slowly or the small funnel (1 1/4"W x 1/2"D) will overflow. When it's enough, you can hear the flask fill to the brim. I figured the best way for me would be to pour 8 ounces into a mug so I know when to stop. This handy cap is securely attached to the neck of the bottle. You know if you've already enjoyed a good share, you're not going to lose it. Convenient bottle for camping/travel and gifts. 5 Stars