The Cloaking Umbrella is a device with the appearance of a common umbrella equipped with the same cloaking technology as S.H.I.E.L.D.'s aircraft.
With the Cloaking Umbrella in his hand, Sam Koenig beckoned Raina over to him as she was being chased by HYDRA operatives. He hugged her as he lifted the umbrella and it encased them. The cloaking technology activated while Koenig kept Raina quiet. After the operatives ran past them without seeing them, Koenig introduced himself to Raina.