The BYOB 13 is designed to accommodate a mirrorless or DSLR camera (including Pro size with grip) along with 3-5 lenses (up to a 70-200mm f/2.8 attached) and additional accessories. It serves as a protective insert for carrying a camera within a larger backpack, suitcase, or handbag, with a soft shell that conforms to the shape of any bag. It comes with a removable shoulder strap, allowing it to function as its own camera bag.