@marko. Your right but its not really a bug. Pack rat doesn't increase carry weight it reduces every items carry weight by 25% or 1/4 so you get 125% or 5/4 total carryweight.
Pack rat doesn't increase carry weight it reduces every items carry weight by 25%
nope , you receive +33% of your actual carry weight so you get 133%
196kg is max carry weight with pack rat, strong back and 10 strenght.Check my second crafter