How much weight should I start with in a weighted vest?

A commonly cited rule of thumb in communities like r/Rucking is roughly 15% of bodyweight in a vest (versus up to 30% in a backpack-style ruck). Many r/walking posters report that even 10–12 lb felt surprisingly heavy at first but normalized within a couple of weeks, so most reviewers suggest starting light and using an adjustable model so you can add weight gradually.