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
the 0.4L just fit in, if you definitely fills the cup to the brim. But the drinks stay nice and warm, and the cover - with silicone seal, thus also a fine, smooth 'mouth wall "holds good tight.