My bag is huge but I don't keep too many things in it.
Wallet, phone, earbuds, car keys, chapstick. Sometimes plastic bags. Side pocket has replacement contact lensesx3, a bracelet, keys to work, and the card from the purse manufacturer.
I like really big bags (big enough to fit a folder or piece of paper in without bending it.) I use the extra space as storage, like if I go to the pharmacy or grocery and just buy one thing.
I can fit a whole wine bottle in there! woo.