Lightweight feel. Heavyweight style. When stretching is the only item on your to-do list, and what you wear to your workout is what you'll wear to a café later, this adidas by Stella McCartney gym sack saves the day. Pack it into its pocket and drop it into your purse for extra storage on the fly. To reduce our reliance on virgin materials, we make sure that our vegan alternatives also contain a minimum of 25% recycled content.