This is a Coleman cooler bag. There are photos with a 900ml plastic bottle inside, so you can get an idea of the size. I don't remember using it much. I'll give it to someone who needs it. The following is an automatically generated description: Dark blue nylon cooler bag with aluminum coating inside for cooling effect. - Brand: Coleman - Color: Dark Blue - Material: Nylon - Inner Material: Aluminum Coating - Size: Holds one plastic bottle Thank you for looking.