[header] How to can pumpkin [title] Choose glass canning jars that are in good condition. [step] The jars should be free of cracks or chips to prevent any air from bleeding in after the canning process and to prevent the glass from breaking under pressure. They should also have metal lids that screw on securely. 
Two-piece lids tend to have the best seal. [title] Wash the jars and lids with soap and water.