Not sure if it’s been mentioned because I’m too lazy to open every link, but I bought my husband a Mighty Wallet for Christmas and he loves it. http://www.dynomighty.com/
They’re made out of Tyvek.
I’m using a Mighty Wallet now. Probably lighter and thinner than most of the other wallets here, but not really suitable for business use.
Ok that was my first ninjaed post. Isn’t it uncanny how people post the same thing at the same time?