Nike has launched a custom sports bag and ultra-light shin guard using 3D printing technology. The Nike Football Rebento Duffel is said to be the world's first 3D printed performance sports bag. Only three bags were created prior to the Fifa World Cup to be carried by Neymar Jr., Wayne Rooney and Cristiano Ronaldo in Brasil. The Rebento duffle bag is made from a leather upper and a 3D printed base. Taking cues from the Nike Flyknit pattern of the Magista and Mercurial, the laser-sintered nylon creates an intertwined weave on the bag's 3D printed base. The 3D print also gives the bag body and creates a lightweight, yet durable structure that allows for flex. Handcrafted, premium leather is used on the bag's upper and straps, which fits into the 3D printed base without the use of glue or adhesive. In the new shin guard, built specifically for speed, a specially engineered shock system at the back of the guard combines with an outer shell to work together to provide more consistent impact absorbtion than foam. With 3D printing, Nike said it was able to quickly innovate, experiment and test hundreds of patterns and prototypes for the engineered shock system.