My favorites are the BK-15, BK-16, and BK-17. The sheaths are essentially identical in construction. I find them to be okay sheaths. They are not great sheaths, but serve their purpose.
The plastic Becker sheaths (not kydex) are the ones I have issues with. They are glass impregnated and will dull your knife. I learned this with the BK-14 and BK-24. Those two need handles to be practical using knifes. I suggest folks look for a custom sheath.
I like the BK-7 and I guess the BK-10 for fairly heavy duty tasks in the woods or around a camp. I would be uncomfortable field dressing a deer with either. Everyone (Beckerheads or wantabees) always say get the BK-9. It is just too big of a knife for my normal usage and I use short machetes for chopping, but it is not normally in a camping situation unless it is car camping. They say that using the BK-9 is no more or less difficult to use (dexterity and comfort) than the shorter BK-7 and it is a better chopper. I look at the length and even the length of the BK-7 makes me not want to carry it around on my belt often. But it's available if I choose to use it.
Choosing which one depends on your use. I don't chop much with regular knives, so the chopping function is not high on my list and I can baton a BK-15 or BK-16 just fine on little stuff. I use a folding saw for cutting the slightly larger diameter wood for fires if I feel like cutting it at all rather than just sliding it into the fire and adjust it as the wood is consumed.
So, if you want a practical woods knife, my recommendation is the BK-16 or BK-17. If you want something bigger, go with either the BK-10 or BK-7 for normal use or step up to the BK-9 where chopping is an important deciding factor. Honestly, I always will have a folder with me anyway, so the slicing or fine cutting activies are covered. So. I can understand going much larger if you are willing to carry the knife.
