Do women that carry heavy handbags on their shoulder suffer from bad posture?

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I maybe wrong on this one, but then again… I could be right. From what I’ve observed, women that carry heavy handbags on their shoulder do slouch a lot more than women that don’t’ carry a handbag. Ours is a big family and all my female cousins that carry heavy handbags on their shoulder do not have the best posture. However, female cousins that carry a small purse in their hand have excellent posture. Have I nailed it on this one? Feel free to add few more nails to my coffin.