Well,

Coming here with a family of 4, road trips to visit colleges, vacations, etc. I can let you know about some items. Std. roll-on bags will fit vertically in the trunk. You would be surprised to see how many... Just use the soft-sided bags mentioned above.

On top of that, you can lay garment bags and other flat items. I don't try to fit huge coolers (we have three small soft-sided ones that pack and carry well) or beach umbrella's in the trunk but have carried my daughters travel trunk to GT at the start of the year.

I did get rid of my Expedition (no towing needed now) but kept the Pilot. It mostly stays parked unless the dog needs a trip to the vet. There is NO way that mutt is riding in my nice new car