Can you recommend a laptop sleeve for Dell - Inspiron I75595012GRY

As the title says, I recently bought the Dell Inspiron I75595012GRY (Loving it by the way). I'm looking for a good, snug laptop sleeve for my new Dell.

I prefer a laptop sleeve because I carry the laptop with me in my backpack in college. Any suggestions will be great!

Bonus Q: Recommendations to clean oil off laptop? My fingers leave smudges on the top of the laptop and I want to keep it clean. Many Thanks!