1: A 65-liter bag is really not as big as you think, once you have to stuff it full of camping gear AND everything else. I have a 30-liter speedbag that gets stuffed full of JUST my very minimal camping gear, that's completely separate from everything else I pack. I recommend you actually lay out all the stuff you need to bring and see how much space it takes up.

2: A large bag on the pillion is not an amazing option tbh, especially on something like an R1 where the pillion seat is high and small. You are putting a lot of weight very high up on the bike, and if it's sideways, it will make for awkward aerodynamics.

For your first trip where you don't necessarily want to invest in much gear, I would recommend getting something like this: https://www.xlmoto.eu/product/xlmoto..._pid-PP-111569 It will separate your camping gear from other things you need, and put a lot of the weight and volume below saddle level at a minimum.

3: Does your bike have a top box? One big concern would be getting off the bike and storing your gear. If you are stopping in a city to have lunch and walk around, where are you putting your helmet and gloves? You can just leave them on the bike, but you would be concerned about thieves or just vandals. I would STRONGLY recommend a locking topbox where you can store your helmet and gloves when off the bike, and would be empty the rest of the time as spare storage for e.g. your food shopping for the evening.

4: As a corollary to the previous point: your soft/non-lockable panniers should not contain anything you would be very sad about losing. You may never encounter any thievery in your entire touring life, but you will still be worried about your iPad in your roll-top pannier, ruining your experience! (A Decathlon tent is not worth worrying about for these purposes.)

5: I assume you have it already, but a charging port and good phone mount for navigation. Also, earplugs! They make an incredible difference in your quality of life on long riding days.

6: A rainsuit. Yes, a full-body one. Yes, even if you have leathers.

BONUS: Reconsider camping to begin with. I spent an entire month riding around Central Europe carrying my camping speedback on the pillion of my VFR800, and never once unpacked it. Good camping sites will be hard to access on an R1, the ones that are easy to access will be full of drunk students and/or families, you can't really wildcamp in Southern Europe so you're paying camping fees, and you might as well pay very slightly more for a cheap room or hostel bed that guarantees to keep you dry, gives you fresh sheets and (better) access to a shower.

EDIT: My sportbike-touring credentials attached.

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