Durable bags. Since I always have several with me at any given time I've used them for stuff other than poop like seed gathering, makeshift gloves, bowls, fish from the lake, take out. Long enough and thick enough to complete the job with no leaks and they are easy to twist and knot. But...use them. If they sit around too long they degrade and split down the side seam. Store in a cool place indoors.