Zojirushi Vacuum Insulated bottle are light weighted designed for added portability which is easy to carry everywhere & has a advance technology of the Stainless Mug with Tea Leaf Filter features a Tea Leaf Filter for steeping fresh tea right inside the mug and stops tea leaves from flowing out while drinking. It has a smaller diameter than previous mugs for an easier grip. Some more Features - Stainless steel vacuum insulation keeps beverages hot or cold for hours. 4 cm wide mouth opening. The seamless seal, which prevents drinks from leaking. Combines the seal and packing, is easy to clean without worrying about losing the packing. Leak-free twist-open lid. Compartment for tea-leaves and teabags. Comes with a tea leaf filter that can be easily removed for cleaning. Tea Leaf Filter allows steeping of tea directly in the mug while stopping loose tealeaves from flowing out while drinking. Ultra-lightweight and compact design. Easy-to-clean nonstick coated interior.