In order for the fruit to sit properly, the bag will need to be weighted down. This will keep the bag from becoming top-heavy and also keep it secure if using outdoors on a windy day. To add the extra weight, pour a four-inch layer of pea gravel in each paper bag.
Add reinforcement to the inside of the paper bag with cardboard. Cut the cardboard long enough to wrap around three sides of the bag. When cut to size, insert the cardboard into each bag. Keep the top of the cardboard tucked just below the top of the folded rim.