The structural design of a paper bag requires the appropriate selection of dimensions, bottom configuration, and bag structure based on the product's nature and requirements; common structures include bags with block bottoms, open-mouth bags, and self-standing bottom bags. Tensile strength and sealing performance are crucial for ensuring the integrity of the packaged product.
Based on material, paper bags can be categorized into types such as kraft paper bags, white cardstock bags, and coated (laminated) paper bags. Kraft paper bags are tough and abrasion-resistant, making them suitable for heavier items or products requiring robust protection. White cardstock bags feature a clean, smooth surface and excellent print quality, often serving as packaging for premium goods. Coated paper bags offer water and oil resistance, making them ideal for packaging fried foods or items that may come into contact with liquids. Kraft paper bags can be further classified by usage into promotional totes, shopping bags, and gift bags.
Creating eco-friendly paper bags from biodegradable materials represents a key area of innovation in paper packaging design. For instance, a patented design for a new type of embossed eco-friendly paper bag incorporates magnetic strips within the folded top hem to enable sealing, while a waterproof film applied to the exterior enhances practicality.