Equilibrioception (balance), could be a skill/stat
One could be able to be knocked down while fighting (adds reason to train unarmed, for a tackle/push move) as well as have a chance to trip while running which increases while encumbered or when sprinting and decreases while walking ( a reason to walk...).
Distributing items among pouches evenly could give increases balance and putting everything in one could make you fall to that side with increased probability.
Number of items, logically, would also affect balance, so even if you arent over encumbered it would make you vulnerable if you say had 90 recipes on you
Id love to hear the thought of other players regarding this.