I've got a kuryakyn grantour bag that I used on my last bike that didn't have saddlebags for trips and it worked great. Comes with multiple straps to secure it with. I also have a kuryakyn gran cruise bag that is much smaller but works great strapped to the passenger backrest when I do rise with a passenger.
2011 Cross Roads Sunset Red
OEM short windshield, passenger backrest, crash bars, saddle bag bars, heated grips, vinyl closeouts, tachometer, ambient temp, LED headlight, luggage rack. WD lay down licence plate.