It is entirely dependent on the luggage allowance policies of various carriers. For example, on Emirates, Cathay Pacific, Air India, Malaysian Airlines, and British Airways flights, the maximum weight allowed for a single piece of luggage is 23 kg and a carry-on bag is 7 kg; on Qatar Airways, however, the maximum weight allowed for a single piece of luggage is 30 kg, and a carry-on piece is 7 kg.