Lightweight and fashionable, this adidas by Stella McCartney gym sack lets you carry your gear in style. No need to pull everything out to get to what you need from the middle or down at the bottom — the side zip gives you access to everything without opening up the top. The bungee-adjustable cords lets you play with the volume of the bag, so you can change the shape depending on how much or how little you have with you.