Specific case question

Sorry, i know there are a million case/sleeve/bag threads.

But i'm currently struggling to find a suitable sleeve for my mba 13".

I want a sleeve for it's compactness to compliment the air, but i want something more rigid than just material, perhaps leather or hardened nylon on the outside.

But i also want an additional pocket so i can carry my charger round with me. Now there are plenty of bags but these tend to be a lot bigger so i'm looking for something in between if it exists.

I even visited all the shops local to me but nothing was available and i'm in the UK. I found a lot of results in google were from U.S companies which made the search harder.