If you wonder, you can play Skyrim and carry more than 1000 key on your inventory without getting a penalty?
this mod make a key on Skyrim have a weight. all key on Skyrim has a 0.05 weight and can show on your inventory.

This mod requires Dawnguard, Dragonborn, and Unofficial Skyrim Patch.
If you dont have USKP, I very recommend you use it, because this mod need it.

And also this mod has a compatible patch for Falskaar, Wyrmstooth, ASLAL, and many other mod.

Oh one thing, I'm sorry for my bad english.