The window allows the product inside the box to be visible, while the rest of the box can be customized in terms of size, shape, material, and design to meet the specific needs of the product being packaged. Custom packaging boxes with clear windows can be produced by companies that offer custom paper packaging services and can be tailored to fit the specific size and shape of the product, as well as the branding and design preferences of the client. Some advantages of using custom packaging boxes with clear windows include the ability to showcase the product inside the box, the professional and cohesive look, and the added protection and convenience for the product during transportation and handling. They can be used to package a variety of products, including food, cosmetics, and other small items.