S = 30-pack, M = 45-pack.Package Includes: 30pcs A4 size poly folders with hook and loop closure and label pocket. Upgraded Plastic: sturdy Pp plastic envelope folders are waterproof and abrasion resistant. Each plastic folder is 33.3 x 23.6 cm / 13.1 x 9.3 inches. Colorful Envelopes: transparent design makes inside clearly visible and easy to find documents without opening. 7 bright colors help organize different types of files. Functional Design: hook and loop closure, suitable for letter/A4 size paper and small items. Label slot for easy document identification. Easy to Store: easy to carry, keeps belongings in order. Suitable for school, home, work, office and business travel. weight: 1.83 pounds.