I'll try my best, but I'm not good in writing extensive reviews about sleeves, so please bear with me.
So, I got the Mujjo today and it's like exactly I expected it to be after seeing the product photos. The felt is really sturdy, the leather parts are supple and all in all it reeks of good workmanship. The delivery was fast (2 days with standard), the preparing for shipment took quite some time. You couldn't change this with picking express delivery at check out, because they write on their website that express orders are not prepared faster than the regular ones.
The sleeve came in its own sleeve, sleeve-ception, which is a really nice touch.
The sleeve has one compartment for the Mac, a card compartment inside the Mac compartment and a medium, e-reader sized compartment in the front that could hold your iPad, magazine, thin wallet... etc. I don't think it would fit a charging brick, at least not with the huge UK wall plug.
I also attached some pics from my Freiwild and Santi iPad mini sleeves. They are also available for Macs, so maybe it helps someone. The Freiwild one in limone shows some waves on the bottom, that's because I spilled coffee over it and subsequently washed it - which you are not supposed to do with felt. Before washing it, it was super tight. Also you see, around the edges of the Freiwild there is some sort of stiff border. Initially, I had thought it was just there for purely aesthetical reasons, until I dropped my iPad inside the Freiwild sleeve on the tile floor at the airport.
Nothing happened to it, because this stiff border took the fall and bounced off the sleeve without harming the iPad. I have previously dropped an MBA 11" in a be.ez La Robe foam sleeve and the MBA's edge just cut right through the foam and got slightly dented from the fall. I feel this stiff felt edge on the Freiwild wouldn't allow for that.
Last, but not least, the Santi sleeve. It's beautiful raw leather, smells absolutely divine. As it's normal for leather, it changes with wear and adopts quite some character. I personally love it, but I can see that others might prefer their things not to age, so you have been warned.
Hope these reviews are okay and helpful! And I also hope I didn't break forum rules by merely posting links and no personal reviews in my original post.
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Edit: Mujjo originates from the Netherlands, Santi from Spain and Freiwild from Germany. Since I live in the UK, it was easy for me to get these delivered... outside Europe it might be more difficult.