hey kid, figure out what your talking about before you speak. I have an internal frame pack and it carries around 60 lbs of shit. it's huge, makes your back sweat because of the comfy cushy shit(but it's worth it when it's rubbing on your back for 5+ miles. And the frame of my pack is a very lightweight metal. the pack by its self is probably less than 5 pounds. The problem with external is that some have metal bars that show or that stick out. when trying to be discrete, you do not want the shine of a light to reflect off of you...its a dead giveaway. and the metal bars sticking out(some have the bar behind the head) is that if your trying yo get over a fence, dodge through trees, ect... your probably going to get stuck on a branch or something, and because its the frame to your pack...you arent going anywhere until your unstuck...i prefer my sweaty internal.