I collected various items to turn my phone into a purse and this Baggallini bag was the final piece of the puzzle.
I attach it to my phone's shoulder strap when needed (I detach it when I'm not in the car because the bag and keychain add extra weight that I don't want to carry unnecessarily). Combined with the self-adhesive card holder on the back of my phone, that's all I really need to carry around and keeps my pockets free of stuff.