Cap off your favorite Sport Canteen with Straw Cap. Simply pop open the top and drink with ease. Straw Cap fits 20oz, 32oz, and 40oz Corkcicle Sport Canteen + Series A Sport Canteens. *Only fits wide mouth Sport Canteens (20oz, 32oz, and 40oz). This will not fit the 20oz Hybrid Canteen, 16oz Canteen, or 25oz Canteen.