Posting here for others that might be looking for the same info I was. We use our 3-up HO ski right in front of our lake front cottage on Lake Erie, and we wanted to be able to moor it there during the day when taking a break or eating lunch. I read about anchor bags, and a lot of other options but just didn't feel comfortable with what I found until I came across the Cooper anchor. I ordered one, put a 5' anchor chain on it, 20' of line, a bouy, and clasp/hook for connecting to the ski. We moor it in sandy bottom in about 4' of water. We have used the anchor 4 days (off and on) and left it in place overnight twice. In all instances it performed flawlessly. One of the nicest things about it is the lack of weight and better performance. I do not work for them nor do I get any compensation. Just sharing what I have found that works for me. Nylon Cooper Anchor - Cooper Anchors for jetskis, Kayaks, boats
http://cooperanchors.com/wp-content/uploads/2013/11/1.jpg
http://cooperanchors.com/wp-content/uploads/2013/11/1.jpg