I went with number 2 because I thought that it would be a bit more flexible in the sizes it could carry. All the main straps are removable so I gues if one breaks it can be bodged/upgraded.
I'm not touring for months with it so I think it will do the job for quick overnighters.
i'm stuck between these two 1 2 . Have never bike packed, is no 2 a better fixing option?