What 2 Pack

I have about 5 weeks left until I meet my baby boy m, although with the way he's been laying so low, I believe it will be sooner. I started packing his hospital bag today to go ahead and get that out of the way when I realized I need to pack an extra bag for him because the baby, my BF , & I will be staying with his parents for a few extra days before and after I have him. My question is how much and what should I pack.? I don't want To go overboard and pack everything. Like how many onesies, socks, bibs, everything...I'm really starting to freak out because I don't want to forget anything.! Any help will be greatly appreciated.!