For a tidy bench and modern convenience, the disposable clean white bags have an adhesive strip across the top for taping to a wall or fume hood. Peel back the plastic strip to expose the adhesive and press into place. Back panel with the adhesive strip is longer than the front panel allowing for easier opening. Made of 1mil high molecular weight, high density (HMHD) polyethylene which is steam autoclavable at 121 degrees C (250 degrees F). Maximum weight of contents should not exceed 1.4kg (3lbs.).