Insanely useful.  Not every human activity is conducive to carrying a large bag of stuff along with you.  This little flip-purse wallet thingie will help you carry the essentials when you want to, say, go on a run, or on a quick outing to the corner shop.  It has a secure grip to hold your phone in place (large phones work just fine - check the dimensions below and measure your phone to be sure), three slots for cards, plus a compartment behind the cards for paper money, receipts, shopping lists or your ID and other stuff, plus a handy snap closure to make sure it all stays in securely.  The detachable wrist strap handle make it easy to treat as a mini bag, or remove it to use it as a clutch/wallet.
 
Extremely well made with beautiful stitching, it will definitely last longer than your phone's lifetime does. Seriously.
 
Comes in Stone with Black interior or Burgundy with Buff interior.
 
Made from PU tabby leather (fake leather with a nice texture), with detachable "wristlet" strap handle.
One phone case with 3 card slots, and one multipurpose larger capacity slot behind.
Compatible with Phone size: 151mm to 165mm Long and 60mm to 80mm Wide.
Snap closure is secure, but still easy to open and close (NOT one of those you fight with and leave open because it's a pain).