What are everyone's favorite travel bags?

I have a weird obsession with bags... I have wayyyy too many. BUT, for travel I always stick to the same ones (I'll list them out below).

I am curious what everyone else is using?

• Big Suitcase/Check Bag: Patagonia Duffel 100L (This one)
  
  Carry On: Travel Pro Platinum Elite 21" (This one)
• 
  
• Backpack/Personal Item: AER Travel Pack Small (This one)

What I love about this setup is that I am still super mobile even if I have to pack every single bag. I try not to check a bag, but when I do I prefer a duffel.

This way when I am navigating the aiport/trains/etc I can have my backpack on my roller carry on and wear the duffel as a backpack. I prefer that to rolling 2 bags around.

So what do you like to travel with?

Hmm...I'm still trying to find it. My perfect bag would be a lightweight, durable, water resistant backpack with waist belt and wheels, that is not bulky. Every inches and pounds are precious to me.