When it comes to packing and touring, everyone is different. Do you want to take the kitchen sink with you or go as light as possible? Only you can decide, but by all means get as many opinions and info as possible. In 2022/23 I did a perimeter tour of the US. I was on the bike for 323 days, did 10,520 miles and climbed over 400,000 feet. I never did a tour in my life but I did a lot of research and decided what worked for me. I used a mix of Tailfin and Apidura bags and they were flawless. In total I gave myself about 100 liters of storage, and never used the whole capacity.