Rinse five 1-cup freezer-safe containers and lids with boiling water. Dry thoroughly., In a large saucepan, mix strawberries, peaches and pectin; bring to a full rolling boil over high heat, stirring constantly. Stir in sugar; return to a full rolling boil. Boil and stir 1 minute longer. Remove from heat; skim off any foam., Immediately fill containers to within 1/2-in. of tops. Wipe off edges of containers; immediately cover with lids. Let stand at room temperature 24 hours., Jam is now ready to use. Refrigerate up to 3 weeks or freeze up to 12 months. Thaw frozen jam in refrigerator before serving.