Hoarder

Hoarder is a Trait in the Fallout: New Vegas add-on Old World Blues.

You've developed the anxiety disorder symptom of hoarding, in which you have to keep essentially everything. While you can carry 25 extra pounds of equipment, the weight wears on your S.P.E.C.I.A.L. stats, dropping them by one when you have less that 160 pounds of equipment.