I use a Bikers Friend bag on my TBA. You don't need a sissy bar or luggage rack..they install easily. I know they are available ion 4 sizes. I use a large, it holds all I need for work and when I remove my work stuff, my helmetand jean jacket fit inside perfectly. It has side pouches inside and out for little things like sun glasses, pens etc. They also have an adjustable backrest.
