Just got back from riding the MABDR. On a recommendation from an expert at the 2019 BMW MOA National Rally, I used the Reckless 40's. These required some adaptation to use on an F800GS, but it was not too difficult:

https://oldpescady.smugmug.com/Motorcycles/Reckless-40

For this trip, I added a Touratech rack and simply looped the straps through the slots. Since I always take more gear than necessary, the 4L Molle bags provided some extra space for (thin) sneakers, extra gloves, an emergency charger and cables. They provided just enough extra space. Using the 8L Stinger dry bag and the beaver tail, nothing had to be jammed in. The dry bags on the Reckless system were watertight:

https://oldpescady.smugmug.com/MotorcycleTravel/MABDR-Dump/MABDR-Dump/i-4FwLCXQ/A

Had to park overnight during a heavy rain. One of the Molle's did not keep all the water out. Could have been a poor seal on my part. The system served me well overall, though. I would do it again with the same luggage in a heartbeat. Thanks to Mosko Moto for a very well thought out system. I'd recommend it to anyone who wants a system for an adventure of a week or so.

https://oldpescady.smugmug.com/MotorcycleTravel/Mid-Atlantic-Backcountry-Discovery-Route-2020/i-zKcXsCr/A

https://oldpescady.smugmug.com/MotorcycleTravel/Mid-Atlantic-Backcountry-Discovery-Route-2020/i-44vJBxZ/A

cool！

MOLLE 4L pouch is purchased 2 sets in addition to backcountry offset 25 + 35.
One on the 40L duffle back. Attach one to the bottom of the backcountry and use it. I don't think it's waterproof, so I'm going to put the extra dry bag in the backcountry and use the MSR water pack. I think there are endless possibilities for each person. But I'm happy because I have too much luggage.

I have only heard of Moski Moto, but never actually seen the products I bought or touched them... they are beyond my expectation and are happy with what I purchased

Looks good love providing free marketing for great companies