Franco,
As you plan on CC touring, you won't have a need for shelter, sleep system or mess kit. The climate will determine how much extra layers you foresee needing. If your chosen window for your trip forecasts moderate weather, lay out all the clothing you think you will need for the duration of your trip. In addition consider any other essentials you may need for the environment you will be immersed in (bug spray, sunscreen, bear spray, bear cannisters, etc.). If you already have wool clothes, you may be able to get away with only 2 sets of clothing, depending upon your duration. Provide space for snacks and hydration, and you might be pleasantly surprised how little you will really need (vs. want). Based on everything you plan on taking, your luggage needs can then be determined from there.
We are currently touring right now. We started in Kalispell, MT, heading west on the Northern Tier route (we are currently camping in Ione, WA). We plan to eventually make it to Bellingham, WA where we get on ferries to Anchorage and then Skagway before riding in Alaska and Yukon Territory (yes, we are carrying bear cannisters and bear spray). We finish at Denali before boarding a ship to Japan where we plan on cycletouring there. Plan to return home before Christmas 2025.
We've e been touring since 2016 and over these years we've finally come to the conclusion that less is more.
Have fun!!
Jeff & Lori