Binford,
My loaded sheath is 5" by 2 1/8 " by 2", but smaller than that because it's rounded and thinner in places...
The benchmade combo sheath is quite versitile, under the adjustable flap, the crunch sits in the back pocket of the sheath and protrudes about 1/2 " , and is easy to deploy. The CYB41 fits in the front pocket, which is elastic and stretches to fit the 41, and the 41 protrudes about 1" above the lip of that pocket. It seems a little tight at first, but is more secure than I expected. I can remove either tool without distrubing the other, but returning the crunch to the back pocket while the SAK is in place takes a second or so. (Note that theh CYB41 is 8.5 layers, so anything smaller would fit also, due to the elastic).
I've had it for a few months now, and it (the sheath) has held up well, but since it is thin nylon, I expect it to wear out eventually.
I would love to get a similar leather front/back sheath, but no such thing exists. One of these days I'll probably _try_ to make one.