pack, if I remember rightly, is resistance to flow by constriction.
You can make a shock 'feel' the same with a large hole and 70wt oil or a small hole and 35wt, the fact is, the lighter the oil, the easier it is to flow, but you have to have a small hole to restrict it.
Easiest way to sample pack, is build a set of shocks up, with a large hole and normal oil, stick them on the car and watch what happens when you drop the car, then go to the pistons you should have, the results are pretty big.
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