I don't know why, I just know I've always always always been a bag girl. Before I was into purses, per se, I'd even get excited to choose my book bag for school or a duffel/gym bag. It runs that deep in me, lol. I just get very excited about materials and details and function and how it feels when a bag has just the right weight to it.
I think it also has to do with how a bag can define you. Not the bag itself, but the contents. Think about it, what you carry in your bag is like a curated summary of who you are, for the day at least. The particular lipstick or lipgloss you use, your wallet, the cards you carry, your car keys, do you carry tissues or hand lotion, etc. It's like all your favorite things or necessities kept safely in one spot, and the particular items you chose speak to who you are. If you peek in any of my handbags you are likely to find a Fresh lip sugar, an Aveda or Kiehls hand lotion, Nars lipstick, my beloved Chanel wallet (or coming soon a BV wallet) and a pair of Barton Perreira sunnies among other things. Everything chosen for one reason or another and no one else's handbag will ever have exactly what mine does. Now that I've said all that, I think the handbag is the most personal of fashion items, the easiest to take on as mine.