As far as remember, in Oblivion there is a spell for carrying more weight. Is there a similar spell in Skyrim?
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.
You don't have a spell. However, there is a potion of fortify carry weight.
There are also items with fortify carry weight enchance.
If you disenchant that and you use restoration glitch and use OP fortify enchant, you can create an item with insane amount of carry weight.
There you go. You will never have to worry about weight again.
How to get that boot?
Buy item with fortify carry weight. Go here.
It usually has names like: All varieties of Boots of Lifting All varieties of Boots of Hauling All varieties of Boots of Strength All varieties of Boots of Brawn All varieties of Boots of the Ox All varieties of Boots of the Mammoth https://en.uesp.net/wiki/Skyrim:Fortify_Carry_Weight
So you can learn the enchanting
Use fortify restoration glitch to create op fortify enchanting potion
too long to explain here. https://www.google.com/search?q=skyrim+fortify+restoration+glitch&oq=skyrim+fortify+restoration+glitch
Drink a 20k% -30k% fortify enchanting potion
Too much and the game will crash. Too little and why bother?
You have 30 seconds to fortify your item with your fortify carry weight.