With vacations and trips our normal water and food intake gets easily disrupted. As does our activity level. So needing a normal amount of diapers can get disrupted just as equally. Whatever number of diapers you normally need, always bring about 20% more. Or a minimum of 2 for really short trips. Yes, lugging around spare diapers you probably won't use is a pain in the rear, but running out is worse.
As for hotel stays, bagging and disposing your diapers is being extra nice but is also unneeded. At a minimum, just make sure your used diaper is in a trash bag next to the undersized trash can and you'll be ok. Bagged and tied off if it's a messy diaper too