Header cards (or display content) serve two purposes: it gives you a way to seal off poly bags, so products don’t spill out, and it helps with product branding. Header card printing is popular because simple toppers are a cost-effective packaging solution. You can even add holes on top (small round hole or sombrero-style) so they can hang on a stand or rack. We have common sizes that perform well within the market, 6×6 / 4×4.