https://www.amazon.com/Bungee-Luggage-Suitcase-Adjustable-Travel/dp/B076BGJ5W2/ref=redir_mobile_desktop?_encoding=UTF8&psc=1&ref_=ya_aw_od_pi
Why have I never thought of a bungee system to help with multiple luggage pieces? Glad someone did! This set is made of microfiber,nylon and plastic with a max loading weight: 35kg. The belt length is 46"-78" / 120-200CM and belt width 9f 2" / 5CM with a universal luggage strap that will fit a 20"-32" suitcase.
You can connect two items as one, fixing one bag, laptop case or other item to the larger wheeled travel luggage piece. It is easy to connect your travel bag, laptop bag, or clothes to your suitcase. Leaving your hands free to carry another bag.