Flask and Shot Glass - Heavy weight cotton canvas cover with a BPA free, leak proof, and airtight liner which holds 120 ml/4 oz of liquid. specification: Holds 120 ml/4 oz of your favorite libation. Our canvas canteens are made using rugged cotton canvas construction and design forward graphics. A 1 oz spun aluminum shot glass tops off the flask for easy sipping. Fits in your back pocket when full, folds flat when empty. innovation: