why are people so crazy about the hospital bag when pregnant?

My daughter is now 7 years old and I packed just about everything the first time around. This time I'm only doing a phone charger, toothbrush, toothpaste, towels, soap, house slippers, robe, some bottled water (because I just can't use the hospital sink water to brish my teeth for some reason), and one outfit for baby to go home in. The hospital has everything else I need. I might have forgotten one or two things but it will come to me by December. I guess it's different the second time around.