For the minimalist who only likes to carry the bare essentials. The Thin King wallet is designed to hold only a few cards, so choose wisely. It’s 8mm thick, so it will barely spoil the lines of your jacket or trousers.

Not only is it strong – it's made of anodised aluminium – but it's lightweight too. It will hold between one and four cards, and also claims to keep them safe from RFID scanners and other scams, if you're on the paranoid side.

Firebox.com