I have a Large Ameribag Healthy Back slingbag that I've used for years. I bought it from Sierra Trading Post if I remember correctly. Mine has an addt'l strap that holds it close to your body (it runs at a right angle to the shoulder strap)for doing an OJ through the airport. I haven't seen a model quite like mine anywhere else (haven't spent a lot of time looking, though), a Google search may be worthwile. It's Cardura & despite hard use doesn't really show much wear.