I've had this little wallet for years and have always received compliments on it.  This wallet used to be marketed as a small travel organizer and as a minimalist wallet for Europe and it still functions best that way.

I have one of these permanently tucked into the pocket of my carry-on: my passport fits perfectly in the slide pocket and my airline cards are neatly tucked into the card pockets.  The front ID pocket usually hold either a transit pass or a few lounge passes or drink chits.  The back zippered pocket holds a few quarters and a few coins of the correct denomination for a phone call at my transit airport and at my destination (in case my cell phone doesn't work).

If I'm headed to Europe, I usually carry a second Euro Slide in a different colour that holds what I need when I get there: the passport sized transit pass/rail pass, local calling cards, train tickets and of course coins for phone calls.  My passport also gets moved over from my travel Euro Slide to this second Euro Slide.

When I'm home, I find this useful for dividing the contents of my wallet into what I need for different activities. There is a "core" (ID, Credit cards, a few bills), and then there is another one to hold my Costco, BJ's & other shopping cards etc. Easy to transfer from bag to bag.

I love all the new colours that are coming out now (used to only be available in black or brown) and plan to buy more.