A belt bag, also known as a fanny pack, is a small, portable bag worn around the waist. It typically features a strap that can be adjusted to fit securely, allowing the bag to sit comfortably against the body. Belt bags are designed to hold essentials like keys, wallets, and phones, making them convenient for activities such as hiking, traveling, or running errands. These bags come in various styles, materials, and colors, catering to different fashion preferences and functional needs. Many people appreciate belt bags for their hands-free convenience, as they allow for easy access to belongings while keeping them secure.