Spyderco Dayhiker, Fallkniven H1, Kershaw Bear hunter, I don't know about toughness, but size and shape are pretty close. For size, you could also look at BM fixed Griptillian. Rat-5 is a little larger, but basically same shape. Of course, around here anyway, you will undoubtedly get posts from the Rats and Hogs that nothing is as tough. I have all of the above knives (except the Dayhiker as it is not out yet) as well as a howling rat, and haven't had problems with any of them. I have done some pretty rough things with the howling rat and the rat 5, and I can say that both are pretty darn tough blades, but since I haven't broken either yet, I can't say which is tougher. From other's experience, I would guess the howler is tougher, but can't say from personal experience.