I've been carrying the wallet pictured below for the past two years.  It's made of tough leather and its still as good as new.  Shaped like the bottom of the pocket to fit better.

I use to carry the the ones with money clips and magnets, but the clips would always fatigue and break before the wallet wore out and the magnets aren't strong enough to securely hold folded bills.  

http://www.duluthtrading.com/store/product/mens-rogue-front-pocket-wallet-11253.aspx?wpc=BRN&tall=N&src=T16WGSHP&admkt=&mkwid=sYd4ULD1V_dc&pcrid=109138672801&pkw=&pmt=&productid=11253%20BRN&gclid=CJOpvM6GxdACFRAkgQodzloMhg