Printables of flour, or oatmeal or other products that usually come in bags look better if you don't fold them square. I usually take some polymer clay and make a little block with rounded edges, then glue the printable around it. In the photo at therightthe flour bag was made that way. If you want the bag to be folded down at the top, glue a strip of paper folded over the top of the printie before you glue it to the clay.

Baking Custard powder was introduced in the 1840s. Packaged mixes for gelatin (Jell-O, Royal, Knox) were introduced in the late 19th century. Pancake mixes (Aunt Jemima) were available in the 1890s. Packaged mixes for biscuits (Bisquick/General Mills) were introduced in the 1930s. Our sources indicate packaged mixes for cake were introduced in 1920's. Betty Crocker/General Mills made them famous in the late 1940s. from foodtimeline.org