This adidas by Stella McCartney belt bag features multiple zip pockets, plenty of storage, and an adjustable buckle strap that can be worn around the waist or crossbody. This adidas by Stella McCartney belt bag features multiple zip pockets, plenty of storage, and an adjustable buckle strap that can be worn around the waist or crossbody. adidas by Stella McCartney fuses performance sportswear with innovative features, redefining the boundaries of fashion and function.