Hack for backpacks without luggage pass-through : r/ManyBaggers
High Sierra Composite V4 84 cm Wheeled Duffle with Hidden Backpack Straps by High Sierra Travel Bags (Composite-V4-84cm-Duffle)
Bag Bungee Add A Bag Luggage Strap Travelon - YouTube
Backpack Carrying System with Adjustable Strap – Ideal for Carrying Small to Medium Size Hard Shell case/Hand Baggage., Black, One_Size : Amazon.com.au: Clothing, Shoes & Accessories
Samsonite Guardit Classy 15.6" Laptop Backpack by Samsonite Luggage (Guardit-Classy-15-Backpack)