Giga, I lost *two* in my youth before learning they aren't for me. Check these out:
[url]http://www.mec.ca/Products/product_detail.jsp?PRODUCT%3C%3Eprd_id=84552444262 2294&FOLDER%3C%3Efolder_id=2534374302883913[/url]
They are about 1/2" thick and will hold cash, a key, a few cards. Brilliant.