Dear Kristin: I know which brand and model backpack I want to buy, but I'm having trouble deciding on the size. My torso length is 19 inches and the break between the medium and large is 19 1/2 inches ...

But height alone isn’t the key factor in pack fit—it’s torso length, or the distance from the point on your lower back that’s level with your hip bones, up to the base of your neck (technically, the ...