Gallup Insulation Flask This Gallup insulated bottle holds 500ml. The bottle is made of double-walled stainless steel. The Gallup Insulating flask is designed to keep your beverage at the right temperature for a longer time so that you can take the bottle. The Gallup Insulating flask is available in the colors black, silver and navy blue. The bottle cap is also a mug you can drink from. You can print the bottle with your own design or logo so you can use the bottle as a promotional tool. You can print your design or logo in up to 4 colors. Also, you can engrave your logo. The bottle is free BPA produced.