Based on this product's specifications, here are some alternatives and similar models
Laptop Bag Briefcase Manhattan 438889M 15.6" Black
Summary description:
The Manhattan London Laptop Bag is designed for laptops up to 15.6". It features a removable shoulder strap, an accessories pocket, and a lightweight design at just 390g. This monochromatic black briefcase is a cost-effective alternative to the Targus TAR300, offering durability and style with a three-year warranty.