With this pack of 30 Wilko Resealable Food and Freezer Bags, you can store and freeze food securely and easily. The contents can be marked on the food bags' ‘write-on' labels. Each 18cmx20cm storage bag's secure press-seal closure helps keep food fresh. Air should be expelled from the sealable bags before sealing and freezing; they should never be overfilled. Always allow hot food to cool fully before transferring to a bag. Keep polythene bags away from babies, small children and pets. Not suitable for use in conventional or microwave ovens.