A device for operating a non sterilized tool within a sterilized room without tampering with the sterilization of the room is disclosed. The device comprises a first bag and a second bag. The second bag is located within the first bag and its opening edges are overlapping the opening edges of the first bag. The overlapping edges are adhered to each other to define an hermetic space between the first and the second bags and to maintain opened the opening of the second bag and that space is treated by means of one of sanitized, sterilized, disinfected or cleaned.
