I'll be doing a 14-day tour in the Pacific Northwest during June and July. ( Washington State and Oregon. mostly east of the Cascades. )
The 14 days will be sag supported. We are allowed two bags carrying no more than 25 lbs. And our bikes. Nothing loose floating about will be tolerated.

. Within one of those two bags must be our tent, mattress, stakes, etc. That will be OK.
. But, I am going up to Oregon on the train. Prior to the tour, I'll be riding about Portland and doing some dressy events with friends. ( I'll be staying in a hotel.)
Next we are on to the tour. No problem there.

After the tour's end in Bellingham, WA, I wish to stay a couple days and see Victoria, BC.. When the sag wagon drops off our stuff, there will be more than I can carry on my bike. In Bellingham, WA I'll stay one day and go over to Victoria, BC for 2 days.

.. Logistically, getting all this stuff up and back seems easy. Probably ship surplus stuff by Fedex.
Not sure how much stuff will I need for the non-tour segment before and after the 14 days of sag support? All in all, I'll probably be gone 21 days.

.. Any ideas. I will be taking my Surly Cross Check. Lighter and easier to get over the mountains than my Full Tourer. Didn't plan on taking panniers. I'll need six days of clothes for the Non-sag portion of my stay.
My question. What is your preferred way of carrying six days of supplies while on the bike? In Portland, we might do a stage play and one night of clubbing. Bike shorts - not appropriate attire. Are skinnier 25 mm tires ideal for heavier panniers. ?
Large back packs, handle bar bags. ?