I have used a Grohmann #3 Boat Knife, Forces model for years, I really like the design and handling. It is actually issued to Canadian Forces as a survival knife and does the tasks very well.
The only thing I don't like is it is hard for me to get as sharp as I would like, being SS with the double bevel. Once sharp, it will stay sharp through quite a lot of use. A great knife for bushcraft. The Forces model has an overlap sheath that prevents loss.
Blade is 4in and the entire knife and sheath is really light to carry, lighter than many locking folders. Cheers!