Alexander Wang re-invents the gym sack The gym sack gets a new lease of life thanks to Alexander Wang and a handful of his hippest friends in a design that fuses technology with charity. The much-maligned gym sack (let's just say its nylon incarnation isn't the chicest of choices) has been given an haute update by New York Fashion Week designer Alexander Wang and a handful of his hippest helpers. Calling upon his network of friends, stylists, photographers, Wang asked this creative coterie to submit their doodles, sketches and photos via the Samsung GALAXY Note II, culminating in a design that is wholly crowd-sourced. The end result is a unisex, drawstring lambskin bag named Wallie, which features a muted, metallic abstract print. READ: Annie Leibovitz shoots Alexander Wang and ram for Woolmark "The abstract print really captures the energy of New York City," says Wang, who is also creative director of French fashion house Balenciaga. The Alexander Wang Wallie Wang added: "This collaboration is a great example of how technology and style can come together in an unexpected but really meaningful way." The limited-edition, £350 backpack will go on sale in September in Alexander Wang stores in New York, Japan, Korea, Hong Kong and online at AlexanderWang.com , and will raise funds for Art Start, an award-winning US charity that uses the arts to nurture the creative talents of at-risk children and youth. Perfect for cyclists and gym bunnies alike, we're counting down to September...