As others in this thread have pointed out, Stocard is a handy solution to a fat wallet but is limited by the fact that flatbed scanners (such as at Coles or Woolies) can't read your phone screen. Have had no problems using it with handheld scanners however, such as at IKEA.
After this thread stimulated my interest, I decided to take the plunge and buy the Bellroy Note Sleeve - absolutely love it so far! Great quality, functional enough and hopefully won't slowly rub a hole in my suit pants as other wallets have!