Bake a masterpiece with Ateco 13. 4" Superflex Decorating Bag. Ateco 13. 4" Superflex Decorating Bag from Ultimate Baker. Ateco's Superflex Decorating Bag is designed for both food service and home use. Pliable, strong, stain resistant, easy to grip and easy to clean, it's great for piping foods. The Superflex decorating bags can be used with both hot and cold foods and is microwave safe. Made of food grade TPM, it's flexible like silicone but doesn't balloon like silicone. By Ateco. Since 1905, Ateco has supplied fine restaurants and bakeries with quality built, specialty baking tools. Ateco products are internationally renowned for their high quality. When you use Ateco products, you're not only enjoying quality craftsmanship, you're also enjoying quality design; the products are a result of over one hundred years and four generations of innovation and development.