Sometimes filling piping bags with frosting is almost as challenging as actually using piping bags. To solve that, Sung suggests nestling it into a cup to keep it upright as you fill it. "Use a large deli container, yogurt container, or glass to help fill your piping bag," says Sung. "Just place the piping bag into the container and fold the edges over, allowing both your hands to be free to fill the bag with buttercream."
More: Learn how to fill a piping bag.