Liquid Solutions Thunder Coffee Press Tumbler - 14 fl.oz.

I got this to work o.k. but has to carefully follow the directions. First you boil water someplace and put the water and coffee in the mug. Then you carefully put the lid on for two to four minutes to let it brew. Then you carefully and slowly push down the plunger. Then, to stop the brewing, you slide the lid into the open position. From the instructions: "This releases the sealing disk that will slide down and secure the grounds, keeping your beverage full of flavor without overbrewing. You can even add cream and sugar without removing the lid." The coffee did not have grounds in it but the whole process was somewhat complicated. I think the mugs would be good for camping but I don't think I will bother with it for everyday use. For that I'll stick with my manual Melitta.

The product simply does not work; the press valve is smaller in diameter than the mouth of the mug, so when it is submergered, the grinds easily rush into the drinking chamber, conducive to a vexingly crunchy cup of joe.

It works as advertised, although the instructions for the washer that "stops brewing" are not clear. That, and the plunger/strainer only goes about half way down the tumbler, giving you about 8 oz of coffee. To get the rest, you have to figure out a way to strain the grounds out. Don't see any use in a 14 oz mug that produces 8 oz of drinkable coffee. A better design would be to make it smaller, with straight sides so the strainer would go all the way to the bottom.