As heavy duty as they are, I'm just not a fan of saddleback bags. They're just too busy with buckles, straps, etc for my tastes. You may have decent luck finding an old used coach leather messenger on ebay for around $100, or a vintage leather postal bag. I'm in a similar boat, but not that urgent as my 12 year old timbuk2 bag is still going strong.
5/3/12 at 7:34pm