1. Size: Classic 100% leather Messenger bags come in different sizes to accommodate laptops of different sizes. The most common sizes are 12-inch, 14-inch, and 16-inch. 2. Material: The bags are made of 100% veg-tanned leather, which is a high-quality and durable material that can last for years with proper care. 3. Compartments: The bags typically have multiple compartments to hold not just the laptop but also other items like chargers, phones, and documents. 4. Closure: These bags have different types of closures, such as zippers, buckles, magnetic clasps, and push locks. 5 . Handles/Straps: The handles are padded for comfort, while the straps are adjustable to fit different body sizes. 6. Design: Classic 100% veg tan leather Messenger bags come in a variety of designs, from simple and understated to more elaborate and stylish. These bags have extra features like exterior pockets, stitching, or metal hardware.