I put blades in the plastic case they come in. Mark it used and keep in drawer. Have not disposed of too many but now might ask doc if I can bring them in and put in his red bin on the wall. Needles go in pill bottle too, not in trash. I usually buy the five pack of blades at JoAnns when I have coupons. Use plastic case from previous purchase of blades to put used ones in and as I said, mark it USED or red marker.