07-22-2011, 04:26 PM
This would be because of your centre of gravity. When wearing the vest, the weight is distributed fairly evenly around your natural centre of balance, whereas the same weight in a pack on your back will pulled your centre of balance off-centre. An analogy would be that loading weight onto a wheel hub would not cause it to turn, but placing a load on any point on the tyre will disrupt the balance with undue leverage and cause immediate movement in the wheel.
Crispvs
Crispvs
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