I've seen many different sizes of package cages so you would have to call who you are getting them from to know for sure. No matter what size it is it shouldn't be wider(narrowest measurement) than 6". You could place a empty super shell on top of the hive you are starting them in and place the cage inside of that on it's side. Which ever way you do it you still need to shake some bees out onto the queen cage so they can keep her warm if it is cool in you area.