If you want to have a long-term bike trip, bearing in mind that many things can not be transported, this bicycle pannier can solve your problems perfectly.
If you want to drive easy, you can just take a side pack instead of another bike bag.
If you are taking a trip without a destination, enjoying the scenery on the road, meeting friends in the distance, reducing the pressure around you, listening to the sound of nature, this bicycle saddle rear bag is your best choice.