Luxury business backpack designed for comfortable commuting with a "3-way" expandable design. ・Carry-on size ・USB charging port ・Waterproof fabric resistant to rain ・Dedicated PC storage pocket (for laptops up to 16") ・Fully self-supporting design ・Multi-layer design Capacity: - Normal: 23 L - Expanded: 30 L Weight: 1.0 kg Size: - Normal: Width: 31cm × Height: 46cm × Depth: 16cm - Expanded: Width: 31cm × Height: 46cm × Depth: 21cm Color: Black Materials: Special nylon fabric, microfiber synthetic leather, YKK zippers I purchased it and opened it, but I haven't used it even once. It's like new! I plan to get rid of it this week! I have stored it carefully and neatly, and I will pack it securely, so you can use it with confidence. Price negotiation is OK! Thank you! The "Essen" backpack leads the business scene with its functionality and style as the perfect "3-way" business backpack for daily commuting. It boasts a square-shaped, efficient storage space and an expandable depth that allows you to change the storage capacity from 23L to 30L depending on the amount of luggage and the situation. The main storage space features a cushioned pocket that can hold a 16-inch laptop, a waterproof pocket, and two small pockets for organizing small items. It is equipped with an easy-to-take-out IC card pocket to support smooth and safe movement even during rush hour commutes, and a hidden pocket on the back for security. It is durable and comfortable, with an ergonomic back design that makes it less tiring even after long hours of use, and breathable mesh material is used. The special nylon fabric is also water-resistant, so you can rest assured on rainy days. The simple yet powerful black color fits any age and season.