What is a "shoulder bag"?

A shoulder bag is a type of bag that has a long strap designed to be worn over the shoulder. It typically has a single large compartment for carrying items and can come in various sizes, colors, and materials, including leather, canvas, and nylon. Shoulder bags can be used for a wide range of purposes, from carrying everyday essentials like a phone, wallet, and keys, to carrying books and a laptop for work or school. They are popular because they are hands-free, comfortable to wear, and can hold a lot of items.