adidas by Stella McCartney Gymsack in Black. adidas by Stella McCartney Gymsack in Black. 100% recycled polyester exterior and interior. Made in China. Drawcord closure. Internal zip pocket. Front zip pocket. Adjustable shoulder straps. Adidas by Stella McCartney logo. Measures approx 16.25 W x 15.5 H x 4.75 D. ADID-WY81. HG8640. Adidas by Stella McCartney offers women cutting age sports performance clothing they can work out in while still feeling good about the way they look. Not compromising style for performance, the balance is struck between fashion and sport.