A fanny pack is a small, portable bag worn around the waist, typically secured with an adjustable strap. It features a main compartment for storing essentials like keys, wallets, and phones, and often includes additional pockets for organization. Fanny packs are designed for convenience and hands-free use, making them popular for travel, hiking, and everyday outings. They come in various styles, materials, and colors, ranging from sporty to fashionable, appealing to a wide range of preferences.