If a bellman helps you with your luggage, he or she should be tipped $1 for each bag. Never tip less than a total of $2.
For example, if the bellman helps you with only one bag, tip a minimum of $2.
If the bellman helps you with five bags, tip a minimum of $5.
Of course, if the bellman does an outstanding job to help you get settled in your room, do not limit yourself to tipping only $1 per bag.