None, hate panniers, Ventura system and tank bag, that is all 
Yeah, I like that too. In the video with the duffel thing, he takes that off, puts it on his back, then shows that he has two hands free for quick detaching the panniers and carrying both of them at the same time with their handles. He also showed how to attach your helmet to the bag so you don't have to carry that. So that's one trip into the hotel to take all your luggage and helmet, rather than two trips.Thanks for mentioning Mosko, have never heard of them. I like that some of their products have the ability to double as back packs should you want to get up and wander.