Just MHO but saddlebags and sissy bars ruin the lines of a bike. And I only need luggage once in awhile. I found a compnay in Colordao called Wolfman Luggage
www.wolfmanluggage.com that sells a tailbag called a Beta bag that has an inverted "U" shape that fits over a standard HD two-up seat beautifully. Two straps go under the passenger pegs and two more go under the tailights. I got mine this past weekend, filled it up with balnkets and rode the bike like I'd stolen it. The bags was tight, didn;t move and even provided a nice backrest...I love this bag.
The standard Beta seemed too big for me and when I e-mailed them, Eric wrote back and told me about a "Mini Beta" that was in development. He sold me a production sample, and it is perfect.
I ma in no way affiliated with these guys, just thrilled that I found the answer to my "I hate saddlebags and sissy bars" dilema.