I love my new Zojirushi Flip and Go Stainless Mug.  The 20oz (0.6 liter) is the perfect size for hot or cold drinks.  The mug is vacuum insulated which will keep cold items cold and hot items hot.  It has a Flip and Go handle.  It includes a one-touch, flip-open lid and then its lightweight.  I also like that the mug is easy to clean.  I can't wait to add more to my collection of mugs.