I've got something pretty similar to that. Whole TK fits except for my bucket. It really is all in the way you pack it.
I've got Ab plate, butt and kidney, chest and back all stacked. Then biceps go into forearms which go into your shins which go into the thighs. Only problem is my belt, because my holster is not removable. I even keep my CA boots in the tub, shoebox and all. All fits pretty well.
Before I paid money for any tub, I laid out all the armor on my bed and worked on getting it as packed and small as possible, then measured the amount of space I would need. Overkill, probably, but I am a trooper on a tight budget.