I have one of those vinyl business card holders, with 4 section plastic sleeves. Free promo item from Zofran ondansetron HCI, whatever that is. It's holding 8 hotel cards, 4 airline cards (3 others I keep in my wallet), 4 rental car cards, 3 frequent shopper grocery cards (No Safeway within 500 miles of here!). Between the sleeves, I have airline bump vouchers, upgrade coupons, companion certs, SOS and other employee recognition cards, a copy of Delta Dollar rules, car coupons, hotel and car certificates, a copy of my birth certificate, passport and one visa. This rubber-banded holder stays in my carry-on travel bag and has come in handy many times.