The first designer backpacks were made for traveling and business purposes. Nowadays, designer backpacks come in all kinds of materials and patterns and are not just used for transporting belongings. Today, they have a host of practical purposes, such as keeping your wallet and keys handy, keeping your cell phone in your pocket, or keeping your gym clothes, water bottle and other equipment organized so that you're not carrying too much. Some men use designer backpacks as their primary work attire, while others choose to wear them as everyday attire.