I currently own 5!

Skip Hop Dash Deluxe (Wagon Sr.'s diaper bag)
Petunia Pickle Bottom Boxy Backpack
Petunia Pickle Bottom Touring Tote
Petunia Pickle Bottom Clever Carryall (Target line)
Mia Bossi Katie

I did have a Petunia Pickle Bottom Crosstown Clutch but sold it... way too small for me.
I also had a Kate Spade diaper bag, bought as our first baby-related purchase, currently for sale at our consignment store!
And I did splurge on a Petunia Pickle Bottom Cosmopolitan Carryall (from their Cake line) but I hated the fabric so I returned it.

Yes, I'm a bit of a diaper bag addict.