Most airlines will allow baggage allowances to be “pooled”. That is, if you have say 20kg each, then you can check in 40kg total - in, for example, 1 bag of 25kg and 1 of 15. However, not all airlines have the same rules.

In the airline industry, "sharing" the weight of a suitcase usually refers to the practice of "pooling" baggage allowances between passengers traveling on the same booking. While policies vary by carrier, many full-service airlines (like British Airways or Qantas) allow a group of passengers on a single reservation to combine their total weight limit. For example, if two people each have a 23kg limit, one could check a 30kg bag and the other a 16kg bag without paying excess fees, as the total (46kg) is not exceeded. However, ultra-low-cost carriers (like RyanAir or Spirit) often strictly forbid this, requiring each individual bag to stay under its specific purchased weight. There is also a critical "Hard Limit" for health and safety: regardless of your allowance, almost no airline will accept a single suitcase weighing more than 32kg (70lbs). This is a global occupational health standard designed to protect baggage handlers from back injuries. If a bag exceeds 32kg, you will be forced to move items into another bag or ship it as heavy cargo. It is always best to check the "Baggage" section of your specific airline’s 2026 contract of carriage to confirm if pooling is permitted.