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The concept of an external frame have been around for thousands of years. Simply because it's a superior concept. It's, versatile, easy to build and modify. It's lighter, cooler, need less padding and provides a sturdy rigid platform which can carry extremely heavy loads. You get better posture, it doesn't feel like you're carrying a dead body on your back,
One of the reasons that "killed" the frame pack is that it's a bit harder to travel with on trains and aeroplanes (the frame gets fucked when they toss it around).