Per Staff Rule 7.15, excess baggage means baggage in excess of the accompanied baggage carried without extra charge by the transportation company.
Excess baggage should be avoided to the extent possible in order to minimize the environmental impact of transportation. Staff members traveling by air shall be entitled to reimbursement of the cost of excess baggage for themselves and their eligible family members for one bag in addition to their free baggage allowance or up to 25 kilogram per traveller.