Polyester Drawstring Bag
This bag is great. It's light weight, it rolls up very small and has been made to fit your dogs essentials. It will comfortably hold a harness, leash, poop bag and bow.
These bags are sold separately or as part of a kit. You can view a 3d image of the bag here: https://adobe.ly/2Z3SDgC
16cm wide by 26cm high.