I'm a fan of Timbuk2 bags (based in San Francisco) but not too long ago they made the foolish decision to shorten all the shoulder straps on their bags. I'm sure this saves them a few cents, but it makes the bags less usable for big guys (me) or those that live in a climate where you sometimes have to wear a bulky coat (also me).
And before you suggest that perhaps it is me that has gotten larger while the straps have remained the same size, I confirmed the shortening with personnel at their Chicago store and via the corporate customer service.
And thus began the search for a long replacement strap. This 51-71" strap on Amazon is the very best I've found. If you're looking for a useful replacement strap, and you don't need a wide one, you just found it.