Natural Heavyweight
(Planar Handbook, page 40, DnD 3.5)
[Heritage]
You are descended from creatures native to a plane of heavy gravity. On planes with normal gravity, you feel light and buoyant.
Benefit
Your carrying capacity is doubled. Double the values given in Table 9--1, page 162 of the Player's Handbook, to determine what your light, medium, and heavy loads are.
On a plane with normal gravity, you gain a +2 circumstance bonus on Climb and Jump checks, but you also take a --2 penalty on Balance, Ride, Swim, and Tumble checks. On a plane with light gravity, these bonuses and penalties are doubled (and replace the normal bonuses and penalties on these skill checks).