I live in hot and humid country Malaysia , but of course my bags are always in room /car with air cond. I hardly go under hot sun or expose to rain , because I drive to work etc .Do you live in a humid area? Or is this just a defect in the leather? It's such a shame. I love this bag.
The defective part is the glazing ( leather edge material that seal up the end of leather piece ) , not the leather .