The Maxpedition Micro is made with military grade ballistic nylon and is fully seam taped.  It's rectangular dimensions are just a few millimeters larger than a standard credit card.  It has one clear window inside for ID, and two slots on the other side for a few cards and cash.  There is also one exterior slot for frequently accessed items.

In my wallet, I now only carry my Driver's License, Insurance Card, Bank Card, Library Card, and paper currency folded in half.  My coins I carry in  a coin purse.  My store membership/loyalty cards I have transferred to a smartphone app, or onto those mini-cards that fit onto one little keychain.  Everything else is with the relevant associated gear, like gym card is with gym bag, scuba card is with scuba bag, airline cards with my luggage.

This is my choice for a simple, bare minimum front pocket wallet that lies flat and unobtrusively.  It is far more comfortable and secure than the back trouser pockets or a coat pocket. I find that it gets the job done for 95% of my wallet needs (the other 5% I use an expensive dress pocketbook).

I've had mine for about 2 years now and it has held up well for everyday use, traveling and in the field.  There is nothing really to break down.  It's been accidentally immersed in water a few times with no detriment.  It's so small and lightweight that it can fit inside my hat, or in my passport organizer.  Really, the only way you can much more minimal is to wrap your ID, cards, and cash in a simple rubber band.

Maxpedition makes innovative, high quality products.  This is just an example of their simple, rugged yet practical side.