Called “the best” by Hammacher Schlemmer Institute after testing all travel mugs, this keeps it hot or cold for up to 6 hours with its vacuum and good design technology and it''s leakproof too!It feature a comfortable 16 ounces, a stainless push plate and comes with the new longer stainless fine mesh filter that locks into the inside of the mug for green tea or easily removable filter for coffee or western style tea brewing. It also has a new travel bag and comes gift boxed. Fits in all car drink holders.  This is a thermos that evolved into a mug!