This paper presents a novel universal robotic gripper based on the jamming of granular material. The gripper uses a single mass of granular material that flows around an object when pressed onto it and hardens upon application of a vacuum to pinch and hold the object without requiring sensory feedback. The gripping process is controlled by a reversible jamming transition, allowing the gripper to conform to arbitrary shapes and hold objects with forces exceeding many times their weight. The gripper's unique properties arise from the fact that loose grains in a bag sit at the threshold between flowing and rigid states, enabling the gripper to deform around the target in the unjammed, malleable configuration, then harden when jamming is initiated. The gripping force is contributed by three mechanisms: friction, suction, and interlocking. The gripper is passive, requiring no sensory feedback or complex control systems, and is simple to design and operate. It can pick up a wide range of objects, including fragile items like raw eggs, and can hold objects with forces exceeding their weight. The gripper's performance is influenced by the object's shape, surface properties, and the degree of contact. The paper also discusses the mechanics of the gripper, including the role of friction, suction, and interlocking in generating the gripping force. The results show that the gripper can hold objects with forces proportional to the jamming pressure and the object's size. The gripper is robust and can handle a variety of objects, including those with complex shapes. The paper concludes that the gripper has potential applications in robotics where high adaptability is needed but feedback is difficult to obtain or expensive.This paper presents a novel universal robotic gripper based on the jamming of granular material. The gripper uses a single mass of granular material that flows around an object when pressed onto it and hardens upon application of a vacuum to pinch and hold the object without requiring sensory feedback. The gripping process is controlled by a reversible jamming transition, allowing the gripper to conform to arbitrary shapes and hold objects with forces exceeding many times their weight. The gripper's unique properties arise from the fact that loose grains in a bag sit at the threshold between flowing and rigid states, enabling the gripper to deform around the target in the unjammed, malleable configuration, then harden when jamming is initiated. The gripping force is contributed by three mechanisms: friction, suction, and interlocking. The gripper is passive, requiring no sensory feedback or complex control systems, and is simple to design and operate. It can pick up a wide range of objects, including fragile items like raw eggs, and can hold objects with forces exceeding their weight. The gripper's performance is influenced by the object's shape, surface properties, and the degree of contact. The paper also discusses the mechanics of the gripper, including the role of friction, suction, and interlocking in generating the gripping force. The results show that the gripper can hold objects with forces proportional to the jamming pressure and the object's size. The gripper is robust and can handle a variety of objects, including those with complex shapes. The paper concludes that the gripper has potential applications in robotics where high adaptability is needed but feedback is difficult to obtain or expensive.