... Sterile package, with an inner plastic bag & a plastic+ paper bag. Sealed design prevents leakage.4. Sterile Way: ... Disposable anesthesia breathing circuit, Disposable bacterial/viral filter, Catheterization assistance kit, Disposable anesthesia puncture kit ... Disposable anesthesia breathing circuit, Disposable bacterial/viral filter, Catheterization assistance kit, Disposable anesthesia puncture kit ...