Under the Weight Concept, each passenger is permitted to check in a total weight regardless of the number of suitcases. Often passengers traveling together can also combine their allowed weights. The total weight varies per airline and depends on the class, elite status, type of ticket, flight origin and destination.

Generally, no; most airlines in 2026 do not allow passengers to "pool" or combine their baggage weight allowance, even if they are traveling on the same booking. For example, if two passengers each have a 23kg (50lb) allowance, they cannot bring one single bag weighing 35kg and another weighing 11kg. The 35kg bag would be flagged as "Overweight" and subject to a significant fee (often $100+), as individual bags are limited for the health and safety of baggage handlers. However, some airlines like Air India or certain Gulf carriers allow weight pooling on specific regional routes where the "weight concept" applies instead of the "piece concept." For the majority of US and European carriers, each bag must strictly weigh less than its individual allotted limit. The only exception is often for infants, where a parent may be allowed to distribute the child's small 10kg allowance within their own checked luggage, though this must be verified with the specific carrier.