I work in POP but have touched on packaging design here in recent years, that being said I’d recommend looking into Strata3D for any renderings you might need and they also have a whole suite of software that might serve well for packaging. I think the Strata family of software was heavily geared for packaging design.
It plays very well with the Adobe suite and depending what your exact needs are, could be a good low-cost option.
Good luck!