10 day euro trip help

Hello all! I have a Synik 30L and am looking for suggestions on the best packing solutions for my trip. Looking to “one bag” it, what would the best type of packing cubes / organization in the subs experience to use? Also unrelated other than soaking in the sink is there a preferred spot cleaning product that you all would recommend for my bag ( exterior is sunglow )

Thank you all in advance :)