Introducing the Black+Blum Explorer Flask Duo. Made for two to enjoy. It has two full steel double-wall cups that securely screw on the top and base and will keep your drinks piping hot or ice cold for 24 hours. The thick nylon strap handle makes it easy to hold on the move or when pouring and the stopper has a completely plastic free contact. The flask and cups are all dishwasher safe for easy cleaning. - 100% leak proof - 2 x steel cups - Ribbed body for extra strength and easy grip - Wide base for extra stability - Removeable seals for deep cleaning - Made with 304 18/8 stainless steel, silicone, nylon