I bought a cover for my Legend and it is working great. It is a non-Garmin brand made specifically for the eTrex series (I removed the label, so I don't know who makes it, but they are sold on eBay for around $12 to $14).
It is mostly neoprene, has a zipper for closure, a plastic swivel belt clip, and a velcro loop on the back for attaching to handle bars. The problem was that the clear vinyl front window covered the click stick and was not pliant enough to consistently use the stick. I used a hole punch to place a clean hole in the vinyl window over the click stick area and it works great now. There are also clear vinyl windows for the side buttons and they work fine without modification.
It provides all the protection I was looking for in case of drops and scratches and keeps out the dust. I found I could undo the velcro loop and attach the GPSr to my dash board cover right in front of the steering wheel while driving.
Veni, Vidi, Cachi ...