In the subject line put the number of knees you put on the ground while digging coins and jewelry from the dirt. I'll tell you why. I was talking to a guy that said he just bends over and digs without touching his knees to the ground. I tried this and it was a killer on my back. I also tried putting just one knee on the ground. I didn't like that either. So I guess it's 2 knees dirty for me digging in the dirt. I just feels right for me.