I loved my old purse, an ivory Michael Kors hobo, for many reasons. The built in key strap was one of my favorites. It was so nice to have my keys ready and clipped in whenever I needed them. After a year of city life, the poor purse was more than ready to be retired.
My new bag, a navy tote I got on super sale at Nine West for $30, doesn't have the strap. (It's almost identical to the Hobo bag pictured) So I made one myself by tying a piece of ribbon to the zipper, measuring it out to be long enough to reach a lock and tied my keys to the other end. Voila! No more lost keys.