I love the zoo lion for backpacks or anything to show your love for the zoo! You can print it with words in black so they stand out or just one color and that totally works too! I have traced the letters with a thin sharpie and that works too, but it's better to leave it with one color or do a two color 3D print. My daughter recently went to the zoo for her fieldtrip for school and I thought this would be a fun print to do to add to her tag collection. Enjoy!!!