Picked up one of these at the Zurich Airport. It's big enough for my stuff, but dimensions are about the same as a Celtic Croft/Thorfinn-size sporran. (about 6.5"W x 8"H x 3"D)



It has inner pockets for keys, PDA, phone, etc. It even has a snap closure belt loop on the backside for a sporran strap or you could use the side d-rings. If only they made it in a solid black or olive...

http://www.swissmade.com/en/web/inde...-_shoulder_bag

I got it for 39 CHF.