Heavyweight

 is a perk in the Fallout: New Vegas add-on Dead Money.

Effects
The weight of all weapons over 10 pounds is cut in half. This does not affect weapons modded to weigh under 10 pounds. This is very useful for people who like to carry around large weapons like the Minigun and the Missile launcher, especially the Fat Man with the Little Boy mod, it's original 30 lbs into 7.5 lbs.