No. The bottom pole frame does a great job of providing the needed support. Whatever you place in the bag, however, will give the bag its overall shape. You need to plan your packing to completely fill the bag. We recommend that suitcases be placed in first, straddling both bottom poles. Place items with hard edges in the middle and pack softer items around them.
You may find product reviews on our dealer’s sites that refer to the older version of our Car Back Carrier (called the Cargo Saddlebag) which did not include a bottom pole frame.
For more information, see this article in our blog posts, How To Maximize Cargo Space and Fuel Efficiency.
If you have any additional questions, please reach out to firstname.lastname@example.org.