Wow. Really hard question. Probably Louis Vuitton. I actually love many other designers more, when it comes to aesthetics and design (Balenciaga smooshiness, ahhhhhh), but when it comes to just *fitting into my life* and being easy to wear and lovely to use (hi, best zippers and hooks anywhere) . . . LV is just so irreplaceable. Like, I cannot imagine life without my Neverfull. Can. Not. Imagine. When and if it ever gives out (or, more likely, when one of my daughters grows up and steals it), I will need another one. So, LV wins for that reason alone. Also, the Speedy. It's just a perfect bag that goes with everything and can go pretty much anywhere. They have a nice variety of materials, colors, and dressy/casual/professional bags, so it's really not a bad store to be confined to for life.