Hard to give up a purse, comes in really handy when shopping - you don't have to take a store bag (so many stores will ask if you want a bag now, I feel better when I don't have to take one). I tend to carry a larger purse or tote that can handle purchases up to the size of a bottle of wine, my agenda, receipts, etc. If I am running out quickly, that's different, it's just my wallet, and that is a small billfold that can be quickly flipped open to show as ID boarding a plane.

Days that I commute to work, no purse - those are pannier days!