I'm fortunate enough to have bought an 'Indy Bag' from Noel Howard of MBA Costumiers some years ago and love it dearly as an Indiana Jones collectable but, to be honest, I don't find it practical to be used as my 'daily bag'. I've used a bag since school to carry all my junk and nonsense around in, and the recent surge in messenger-style bags have lead me to seek out an alternate 'Indy bag'.
After much scouting of web pages I eventually came across a company called Ellington Leather (http://www.ellingtonleather.com/
) and they produce a bag called the Hollister Satchel. If you visit this Amazon link you'll see a much better selection of photos than on the official site ... http://www.amazon.com/Ellington-Holl...879359&sr=1-25
It's a really nice bag, especially the strap which is antique-style leather and has a great buckle. There's also a nice design feature which is an external pocket on the side especially designed for mobile phones. Anyway, I'm really pleased with mine and it looks very 'Indy'