I bought several stainless steel utensils from the company Nava along with the warmer, poor quality materials. They leave a metallic taste very quickly, whether it's a beverage or water.

I decided to evaluate it since it had no reviews at all, and similar products that were x3 or x4 times more expensive had many. It is definitely worth its price, it has 2 "ports," one for drinking and one for putting the straw (the package also includes a metal straw). The 2 "ports" seal in a simple and very effective way. With a lot of shaking, maybe a drop might escape, but generally, it doesn't leak at all from what I tried. It seems reliable and easy to clean. Overall, because I researched it, it offers a lot that the more expensive thermoses do not offer and costs much less money. The light blue color I bought is very beautiful. If I notice anything negative along the way, I will note it.

P.S. It does not have harmful substances like BPA, etc., and is made from quality materials. It has a nice non-slip grip. If anyone wants more information, here:

https://www.navaideas.com/product/stainless-steel-insulated-travel-mug-with-straw-we-care-blue-450ml__10-262-111