Large Capacity & Secure Organization: The zipper binder features a built-in 3-inch D ring to hold 680-730 A4 sheets. The bottom mesh pocket securely hold loose papers to prevent curling or damage when the bag isn’t fully loaded. Smart Multi-Pocket Design: Exterior and interior zippered pockets, open pockets, ID card slots, and elastic loops for categorizing essentials like keys, 13-inch laptop and textbooks/tablets, cards, or pens. Stay organized without clutter, perfect for office, school, or travel. Premium Quality: The zipper binder with strap is made of 900D water-resistant material, reinforced stitching and a scratch-resistant surface ensure long-lasting use in any environment. Easy to Transport: The binder with zipper features a sturdy top handle and a detachable shoulder strap,making it easy to carry in crowded areas or when traveling. Excellent After-sales Service: If any quality problem about this 3inch zipper binder, please tell us freely, we will get back to you with a solution quickly.