its most narrow is just 6 cm in diameter, allowing you to carry and use it comfortably. The sleek double-layer stainless steel bottle can hold up to 400ml of liquid and it will maintain the temperature for up to 24 hours. It is the best portable solution for wine or other drinks. Ladies will be able to sip chilled wine anytime during a journey or summer picnic. It has a soft TPE strap double formed on the top cover to provide maximum comfortable convenience and portability.