Isosteel VA-9558 Auto-Insulated 0.4 L of double-walled 18/8 stainless steel incl. Plastic cover with drink opening and non-slip base (household goods) 4
as long as a hot coffee stays warm; for the price absolutely fine. The cover I with a plastic lid from a smart box "sealed" bez. Drinking spout, for my needs a good cup. Recommended.