When measuring for a backpack, you are supposed to measure from C7 to the Iliac Crest, does that mean you?

Question

Should measure straight down from C7 to the spot on the backbone that is at the same level as the iliac crest, or should you measure from C7 down AROUND to the iliac crest on the side?

Answer 1

measure straight down to the same level.  

http://www.prolitegear.com/backpack_sizi...