Diana Lewis vgwn37a All flour is presifted but it settles during shipment. A cup of flour scooped directly from the bag can weigh up to 5 ounces. It SHOULD weigh 4 ounces. To measure correctly fluff up flour in the bag or canister. Then sprinkle it lightly with a spopon into a measuring cup, scrape the excess off the top with a knife. From King Arthur flour