We carry a backpack, the size varies due to time of year. January requires layers and it's easier to stuff them in the pack when you're not wearing them. Ponchos, visors, glasses, we both wear prescription glasses, so changing to sunglasses requires storage of other pair. A variety of over the count medicines. Nothing worse than a headache or sinus attack making you miserable in the park when a pill would solve the problem. Sunscreen! Someplace to put pins that you don't want to trade. And I don't carry a purse, so a few toiletries & hair pick are in there. This way either of us can carry it with no problem.