There are no specific regulations on the size of the express package on the customized market. The express delivery is usually based on the postal Carton, the specific size and the standard specifications of the express carton: Express carton No. 1: Specifications 530*290*370mm. Express Carton No. 2: Specifications 530*230*290mm. Express Carton No. 3: Specifications 430*210*270mm. Express Carton No. 4: Specifications 350*190*230mm. Express Carton No. 5: Specifications 290*170*190mm. Express Carton No. 6: Specifications 260*150*180mm. Express Carton No. 7: Specification 230*130*160mm. Express Carton No. 8: Specification 210*110*140mm. Express Carton No. 9: Specifications 195*105*135mm. Express Carton No. 10: Specification 175*95*115mm. Express Carton No. 11: Specification 145*85*105mm. Express carton No. 12: size 130*80*90mm. Courier bags commonly used size specifications: Courier bag small size: 17X35 mm, 25X38mm Courier bag size: 35X50mm, 40X55mm Courier bag large size: 45X60 mm, 50X65mm Commonly used in express packaging: bubble bag waterproof, moisture-proof, pressure-resistant. It is the best choice for mailing valuables, cosmetics, small appliances, and fragile items. It has the functions of shockproof, anti-breakage, cushioning and moisture proof. Widely used in precision electronic equipment, handicrafts, automobiles, motorcycles, bicycle accessories, ceramic glass products, fire-fighting equipment and furniture packaging. Yanhua Packing Factory is a professional packaging company specializing in the design and production of high-end gift boxes. It specializes in carton packaging manufacturers for more than ten years. It provides all kinds of gift boxes, boutique boxes and high-grade packaging boxes. Yanhua packaging manufacturers are trustworthy!