There's no such spell in Skyrim.

You can carry more weight by:

* Wearing items with the Fortify Carry Weight enchantment
* Drinking a potion of Fortify Carry Weight
* Adding points to Stamina when you level up
* Giving some stuff to your hireling
* Climbing onto a horse
* Using The Steed Stone, allows you to carry +100.
* The Extra Pockets perk, which is part of the Pickpocket skill, also allows you to carry +100.