For our shelf stable cartons (946mL and 250mL), we use a super simple ‘twist and click’ security seal. When you twist the cap, you’ll hear a CLICK, which breaks the seal and punctures the foil simultaneously. Although this works differently than our chilled cartons, it accomplishes the same thing! If you look inside the cap, you'll notice a clear plastic ring with a serrated edge - this is what punctures the foil.