When my kids were little I would travel sooo light. I would put a bottle and a diaper in my purse (for regular errands - not Disney) and away I would go. Now my daughter has a baby and they carry a diaper bag that weighs about 50 lbs (at least). I was carrying the bag and had to put it down. I had to trade her for the baby (in her seat) because she was lighter. I say pack what you think you would like to take and then go downtown or to the mall in your city - walk around for a few hours and then see what you can do without. You might be able to do with less.