What would be a good knife to carry long ways on my belt in the back? Thinking something 7-9" full tang. Was considering a boot knife maybe because of the slim design. Whole point is for it to be unnoticeable. Hence the reason for carrying long ways instead of dropped down. I usually carry 2 knives one in front pocket clipped to outside and one in back pocket clipped to outside. Would eliminate the rear one with the new carry.