I have had this bottle for a while and what I like best is the air tight seal and 6-hour insulation for my morning coffee on-the-go. This thermos is made with stainless steel and uses vacuum insulated double walls to keep items warm. When it is freezing outside I can’t carry it around and have my hands exposed, but I feel at ease that the thermos isn’t leaking inside of my backpack. On Tuesdays, when I have 9 hours of straight class, it keeps my coffee warm all day. It also comes with a tea strainer attachment but the hole are too large to contain the tea leaves. One downside is the plastic spout and seal which doesn’t clean as thoroughly, but overall it is a greatly designed product.