On a couple of long trips I have used a regular 'ol piece of carry-on luggage, which works fine but definitely doesn't look great, and more importantly is a pia to strap or tie down.

I'm looking for a bag for long trips that is a cinch to tie down to the rear seat. Easy on, easy off, and sturdy. I have a givi top case on the rear rack, which is great for getting in and out of the hotel rooms easily, and it would be nice to replicate this ease with a rear seat bag, and with so many options on the market, I'd love to hear feedback on the board favorites. Thanks!

Jason