I tighten down my main pack,( exped lightning) with the compression straps and have a old seatbelt strap arrangement for the shoulder strap on the that I mount the gun to shoot,I bush hunt 95% of the time so need to be quick on the trigger,when animal down I swap over to original shoulder strap for carrying a load,also have an old stony creek blaze vest I put over the pack to keep scratching noise down and increase visibility.
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