Larger than the 21044 vials, and made for us, these Waterproof Plastic Screw Top Vials have a waterproof cap and are more substantial than many other vials. These vials are handy for mini survival kits, fishing kits, tinder, carrying spices in your cook kit, etc. They also hold the UCO Stormproof Matches with striker listed under the firestarter products page. The uses are only limited by your imagination! They are sold 2 to a pack and measure 3-3.16" long x 7/8" diameter (inside), 1-1/8 diameter (outside cap).