Currently, MacBook Pro adapters come with a pair of hinged clips that give you device a retractable cleat. The iLOOP Mac Charger was designed to deal with winding up your loose cords in a different way that actually complements the method that many users employ, regardless of Apple's little transforming feature.
Indeed, it's more common to see people wrap their cables around the square-shaped component, so Devraj Bhadra has remodeled the device. His version tightens its waistline to produce an inset channel around all four sides of the adapter. This provides some guidance for the coiling of the cord, keeps the cord from shifting and iLOOP Mac Charger keeps the wrapped cable within the periphery of the small white box, unlike the cleat system that occupies more valuable knapsack space.