Can provide electrostatic shielding and mechanical protection. The shielding layer of this packaging bag is twice the size of a regular shielding packaging bag. The cover of the bag can be inserted into the bag to protect the items inside, or it can be folded outside the bag and fixed by a label. The inner layer is an anti-static film without amines, the middle layer is anti-static bubbles, and the outer layer has embedded metal shielding film. The external and internal RS: 10Ω to 5x10Ω, T1000:<2 seconds at a relative humidity of 50%.