Diaper bag

How big is your diaper bag? My mom says mine is too big and that I'm supposed to have a small one to take if I'm not going to be out long. In my diaper bag if I'm going to be out at least 3 hr I put: 5 diapers (in case he poops), wipes, half can of formula, 2 extra outfits, extra socks, 2 toys, 4-6 bibs, 3 bottles, 2 bottled waters, 1 receiving blanket, 1 light blanket, 1 heavier blanket (depending on weather). Is this too much? What do you pack?

**lo is 7 months old