The A4 portfolio comes in nine colours, has a bottom and sides and can hold around 90 sheets of paper. Selection of standard cardboard manufacturing, can provide effective protection, texture. Reusable for home, office, business, legal and school files of all sizes. Seal winding design, more firm. Trim edge, round and smooth, do not hurt hands. Thicker solid base, more durable. It can be used to store files and make cluttered files tidy. Can also be used to store important documents, protect documents from dust, wrinkles, curls, etc. Can be placed on a bookshelf or desktop file rack.