We have quite a few options that will allow you to carry either a tow bar box or bikes, but we do also have a couple of options that mean you can carry a box/bag at the same time as bike(s).
The BuzzRack TwinBuzz will take either four bikes, or two bikes plus a luggage platform (and is supplied with a 60l drybag that you can use on the platform).
You can use the Thule Onto 2 rear cargo box on the Thule EasyFold 3, which will also take one bike if you use the 9447 extra bike adapter and the Onto 2 bike arm. You need all four parts if you wish to carry a bike at the same time as the Onto 2 cargo box. You can carry up to four bikes on the EasyFold 3 (with the 9447 extra bike adapter) when you aren't using the cargo box.