Ballistic weapon ammo weighs 45% less.

Heavy Guns weigh 30% less.

Armor weighs 25% less than normal

The weight of all junk items is reduced by 25%.

Weights of all Chems (including Stimpacks) are reduced by 30%.

Your melee weapons weigh 20% less, and you can swing them 10% faster.

Shotguns now weigh 30% less and you reload them 10% faster.

Explosives weigh 30% less.