posture
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I see too many people wearing heavy backpacks with the straps loose so that they’re hanging low on their backs.
Don’t do this. This is how you mess up your back.
You want to carry weight high up on your back. It puts much less strain on all of you. Tighten the straps as much as possible so that the bulk of the weight is under your shoulder blades. You’ll be amazed how much easier it is to carry the same weight.