Mei Li & You tea tumbler is a 350 ml stainless steel flask that keeps your loose leaf tea hot for up to 5 hours. Its special fine filter prevents any leaks. Its large rubber base allows for good stability so the tea doesn't keep brewing whilst in your bag & maintains the strength you have chosen. The tea tumbler is designed for you to comfortably drink from it so you don't need to use a different cup. The tea leaves can be brewed several times a day so you just have to refill your tea tumbler with hot water for more tea.