ONEISALL Double Wall Glass Travel Tea Mug with Stainless Steel Filter, Glass Tea Infuser Travel Bottle for Loose Leaf Tea, 320ML(Stainless Steel) OPTIMAL CAPACITY- The volume of our best glass tea tumbler is 10.8oz/320ml. Perfect for loose leaf tea, fruit infusions, cold or hot organic coffee, cocoa, smoothies or water. Enjoy at home, on the go, work or play. HIGH QUALITY STAINLESS STEEL FILTER- The filter barsket is made from Food-Grade 304 Stainless Steel. Highly resistant to odor, stain and bacteria. On-the-go tea-strainer is convenient to filter the loose leaves and other flower tea saving a lot of time anywhere and whenever. EXCELLENT TEMPERATURE MAINTENANCE- ONEISALL glass bottle is made of borosilicate glass with double walls - this design allows to use the tea infuser mug for hot and cold drinks with the longest period of maintaining the temperature of the contents. BPA free, no taste or smell of the material. DOUBLE LAYER STRUTUREDouble wall Glass borosilicate glass, Insulation Technology keeps drinks hot for 6 hours and cold for 11 hours. Also, can withstand the rapid temprature change of the water from -20 to 150 and won't broke. QUALITY GUARANTEE- Glass Tea insulated tumbler is a wonderful bottle for you and your friends. If you are not satisfied with our tea tumbler or there is any problem with it, please contact us firstly, replacement or refund will be arranged for you.