This supplement is the charge levied by our suppliers (hotels and /or cruise line) to cover the extra cost for sole occupancy of the accommodation. It does not relate to the cost of food, transportation or any other services. For instance, single passengers do not have the right to occupy two seats while on a coach tour. Single supplements can vary widely, ranging from 15% to 50% of the full twin price. When the single supplement is relatively low, it generally means that the accommodation being used (eg hotel) can provide rooms that were designed for sole occupancy.