I want a loose leaf, green tea brewing cup. One that keeps the leaves from entering your mouth when you drink. I already have a plastic one but it imparts a plasticy flavor and that's not acceptable. The one I have now has this mesh basket that keeps the tea seperated from your lips as you drink. It also comes with a screw top that allows the tea to brew without loosing any flavor or spilling while driving. I was thinking a double walled stainless one may be great as it won't shatter. Holding about 8-10 oz of water. This is something that comes in handy when you are mobile....like when you have to run around in the car...or are at a customers account and want a good cup of loose leaf green tea. I don't like tea bags and instead carry some of my favorite loose leaf green teas in small plastic bottles....that way I can have a great cup of tea any where.