Fallout, Fallout 2, Fallout Tactics and J.E. Sawyer's Fallout Role-Playing Game
With each level of this perk, you can carry an additional 50 lbs. of equipment.
Fallout 3 and Fallout: New Vegas
With this perk, you can carry an additional 50 lbs. of equipment. This perk also stacks with Burden to Bear if you have it. It will raise your carry weight beyond 300 lbs.
Notes
With this perk and 10 Strength you can carry up to 300 lbs. before becoming overencumbered.
With the add-on Honest Hearts, this perk allows you to bring 100 lbs. of equipment with you, through a speech check with Jed Masterson.