aterial: High Quality Environmental Pp Plastic Waterproof, Use 16C Thickness, Silk 'C' Is The Thickness Of The File Bag Material, The Greater The Number Of Silk, The Thicker The Material, The More Durable. Applications:Convenient Large Storage Bags Space, Able To Store All Documents, Files,Makeup,And Other Learning Material, Office Supplies And Cosmetics Pouch Bag Envelope Folders feature a button closure designed to keep materials inside secure and organized. Easily pulls apart, while firmly securing flap. Package contains 12 My Clear Bag A4 Size Document Bags Secure Snap button closure secures your documents inside. It is a helpful tool for your study and daily life. Popular and necessary for the students to study and learn.