When selecting red paper bags, the GSM (Grams per Square Meter) is the most critical factor for durability; for standard retail, 120-150 GSM is sufficient, while luxury gifting requires 200-250 GSM white cardboard or art paper. You must also specify the handle type, such as twisted paper, cotton rope, or ribbon, ensuring they are reinforced with inner cardboard patches to prevent tearing. Additionally, confirm the load-bearing capacity, which should typically range from 3kg to 10kg depending on the bag size and paper thickness.