Large Capacity A4 size, bigger than A4 plastic envelope wallet. Holds up to 2.8''/7cm, 1000 pages large capacity, with canvas gusset. Nordun expandable file wallets can help you carry large books and documents easily. Handle Buckle This buckle is taken from the old twist knob version, which is more durable and convenient to use. The strong and portable handle is ideal for business trips. High Quality Made of quality polypropylene Non-toxic and environmentally friendly, recyclable. Durable poly is ripstop and water resistant. Ideal for long-term storage of your important document. Wide Application These large capacity briefcase bags can provide convenient and secure storage of important project files, teaching materials, letters, writing papers, class paints, memos and other office supplies, etc. They are classified and organized.