Just got a SWIFT FOLDER with 8 speed internal hub. I packed it in a old fairly rigid soft American Tourister case.
Outside dimensions: 28"x22"x9 1/2".........The entire bike, inflated wheels and tires and rack too. I didnt have to remove the fork. And the thing is easily carried...it's lighter than my clothes.
I also had a Samsonite hard shell outsde dimensions 27"x19"x10" and it would not fit unless I removed the fork...and that was just too messy.