I switch my handbag every few days, depending on my mood. I used to change it more often but constantly switching became annoying.
I have a purseket, a medium I think, and I no longer use it. It doesn't fit in all of my purses so I now have several small make-up bags that I hold stuff in. For the purses that the purseket fit in it was useful but I wanted something that can go in all of my purses.