You are looking for a luggage carrier bag to carry no backpack and thus avoid pulling in the back?
This e-bike luggage carrier bag has a variable roll closure, an additional lid flap, reflective stripes for better visibility in the dark and an adjustable 3-point luggage rack attachment with 2 hooks 5-10 mm in diameter and a hook for luggage carrier struts.
Due to the extremely durable material with welded seams, the luggage carrier bag is even waterproof.
This bag can be filled with a volume of 25 liters.