Excuse the mess, I'm waiting on a couple of boxes and am doing some rearranging in there.
I took a quick picture with my iPhone camera (not the new one yet, so the quality is terrible). The bottom has a tin pie pan full of beads, with a little ramp I made from a plastic folder to funnel the condensation back to the beads. I threw in a couple of extra bags in the bottom for good measure. The bead tube on top is the largest one from Heartfelt, full of 65%. The bead tray is a 70%, I bought it before I knew I liked 65% better. It's so small it won't make a difference though.
The tray on top is from my desktop humidor (now empty). It's not clear at the back of the unit, there's a little room back there. The two Cohiba boxes are pulled forward, they could sit two deep. Keep things away from the back as much as you can to avoid water getting on your sticks. The PSD4 box on the bottom is pulled forward too. There isn't a whole lot of room behind it. I think that you could barely fit two side-by-side in there. Hardly any room on top. I'll probably pull out that second-from-the-top shelf when the new boxes arrive. I wish I would have purchased the 28, but it was about $160 more expensive after shipping to Hawaii, and I thought it would scare the wife. This one sits in my office and is perfect ... just a bit small.
So, to wrap up, you could fit four Cohiba boxes on that shelf, a couple of PSD4 boxes on the bottom shelf, a couple more on the second-from-the-top, and then a tray of singles on the very top. You could take out all of the trays except the bottom and fit more, of course. Be sure to clean it out properly before you put your cigars in it. Mine took about 3 days of washing with baking soda and fresh water, and leaving it on the back lawn in the sun and fresh air. You'll know when it's ready.
John