I've replaced my wallet with one of these: http://www.allreli.com/product/allreli-google-lg-nexus-5-flip-case-cover-black/allreli-google-nexus-5-16gb-32gb-smar

I've replaced my wallet with one of these: http://www.allreli.com/product/allreli-google-lg-nexus-5-flip-case-cover-black/allreli-google-nexus-5-16gb-32gb-smart-book-protective-magnetic-folio-flip-case-lg-nexus-5-ultra-slim-light-case-wallet-cover-leather-pu-black-0 http://www.allreli.com/product/allreli-google-lg-nexus-5-fli... It has space for two cards and 3-4 paper notes. I have two sets of keys; one with my car keys, the other with bicycle keys + work badge.