>>1787839This comment alone shows the stupidity of internal frame virgins. A properly fitted pack won't even carry weight on your back or your shoulders, it'll be on your hips. Thus it is impossible to get back problems from carrying heavy packs unless you are an idiot who wears them wrong.
Now if you had said "knee problems" then maybe you have a point. But that only happens to infantry carrying 60-100 pounds and even they are too dumb to fit their packs properly.
