Cap off your favorite Canteen with all new Straw Cap. Simply pop open the top and drink with ease. Straw Cap fits 16oz and 25oz Canteen, and even our smaller 9oz. Just cut the to desired length, screw on, and enjoy. Straw Cap comes with two attachable straw pieces. Keep one as a backup for your 16oz or 25oz Canteen or cut it to desired length for 9oz. Sold separately from all Canteens.