I arrange them like this: anything in a plastic wrap and light stuff (like red pepper or spaghetti, for instance) together in one bag, bread-like stuff in another, cans and other metal and glass wraps in another and the toilet paper in a fourth bag.
Do you arrange your shopping bags or do you just throw the stuff inside and make the ultimate mess?
And unlike women, I don't do the arranging at the cash-desk, thus holding the whole line. I don't know about the women in other countries but I have the feeling that in mine not a single woman has the brain capacity to think that arranging the goods in the bags AT the cash-desk holds the whole line and only annoys everyone + the cashier themselves.