So the Mini is a grey one, so it nicely matches my A5 Malden's. In the picture above it is shown next to my black pocket Malden to give you some idea of the size.
Comparing the two, you will see that the Pocket has a notepad slot in the right hand inside cover, were as the Mini has two more card slots.
In the left hand side of the Pocket there is a zip pocket, with a slot behind it, a further slot pocket and another behind that. The last one being quite deep. In the Mini there is again a zip pocket with a pocket behind that and an additional slot pocket.
If you are going to use either of these sizes as a wallet/Filofax/notebook/shopping list type organiser then in some ways the Mini I think might work slightly better because of those slots in the right hand inside cover.
Both have full width outside cover pockets, ideal for bank notes and receipts.
In the pictures above is a Finchley Mini and the Malden Mini. The Finchley has two slots in the left hand side and a large zip pocket in the right hand side. I use the zip pockets on any of these for a small amount of coins, but they can make the organiser quite heavy if you carry too many coins.
I have been trying out the Malden Mini as a wallet for the last couple of weeks, it works quite well. The only thing I've had to do compared to using the pocket size is to relocate my passport to my car documents wallet, which wasn't a big deal really. I also trimmed a health document I carry which stuck out the top a little, once trimmed down it slips in to the back pocket of the Mini just fine.
I don't have that many pages in it, just a WO2P diary insert with some 2011 pages added, some lined paper and some to-do lists. I have bank cards in the front and medical ones in the back.
So I think the Mini is a great addition. It also fits in to my pockets easily if I don't have my 'Man Bag' with me!
Our dear friend Thomas has a Malden Mini which he has been successfully using as a wallet since the London Meet Up in March, he's made some top tab dividers for it too.