I too made sandbags out of jeans. A section of leg makes a simple bag, and the crotch area can be fashioned into a "mule ear" bag. Use heavy quilting thread, and they will last a long time, especially if you don't use old, worn-out jeans. Pick up some nice ones at Goodwill or Salvation Army for $3. Our range is in the sand hills, so filler isn't a problem.