None until you train with 120lbs over 5 miles. That is a crippling load and unless you are a ranger its gonna hurt no matter what you use unless you got time under that load.

All 3 makers will handle that weight.

Mystery ranch is better at the waist belt than the others but they are all quality.

Consider a cart or sherpa <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

Hound