From experience with my Exo and also the terrible issued Terminators in the army which have no frame and use terrible internal stays that bend... the ability for the exo to distribute weight through the hips comfortable and also hug the body helps stop the pack moving around which causes you to be pulled off balance / fighting for balance which all adds to fatigue through your knees. I've had my exo somewhere north of 45kg and though it did slow me down drastically, especially on the inclines, and I was pretty knackered by the end of it all, there wasn't a time where I was in pain or having to constantly adjust the pack or take long breaks. Where as I've had the terminator at 30kg and it's caused me to turn salty real fast with the way it slides down your back over time, pulls on your shoulders and moves side to side on uneven ground
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