Selecting the appropriate substrate is critical for structural integrity. For lightweight luxury items (cosmetics, jewelry), use Rigid Paperboard (Greyboard) wrapped in specialty art paper for a premium feel. For electronics or heavier consumer goods, Corrugated Board (E-flute or B-flute) is essential for crush resistance. If sustainability is a brand priority, specify FSC-certified Kraft paper, which offers high tensile strength and a natural aesthetic. Always confirm the GSM (Grams per Square Meter); a standard high-quality folding carton typically requires 300-400 GSM to prevent warping.