I have an older High Sierra luggage that has wheels, backpack straps, and a detachable zipoff daypack. I never use the daypack but like the larger rolling backpack (checkin size, not a carryon). Whether it would meet your needs I cannot say.

Unless you really need your daypack to be zipped to your larger luggage, I would suggest you buy your luggage (suitcase, duffel, whatever) and daypack separately and use some small carbiner clips to hold your daypack to your luggage when needed. This allows you many more options.

ebags.com is a nice place to look at luggage.