Nakiska vacuum isolating flask The Nakiska isolating vacuum flask has a double-walled stainless steel bottle that is vacuum insulated. This method of isolation is ideal to keep hot drink such as coffee at the right temperature. The bottle comes in gray, the cap is black with orange. The bottle cap can be used as a cup. This cup is even a handy ear. The bottle closes with a screw cap. This screw cap is also a spout bottle so you do not necessarily have to rotate open to pour your beverage out. You can print the bottle with your own design or logo. You can print your design or logo in up to 4 colors. Also, you can engrave your logo. The Nakiska vacuum isolating flask is BPA free produced.