You might be surprised by how compact the package can be when you remove the front wheel and lower (or remove, which is also a very simple operation) the seatpost, with 26'' wheels and a compact frame.

(You might even be able to construct a quick-removal system for the fork and bars; but it just seems unnecessary for most situations. Even without that, the package is pretty manageable. And there is something about a non-folding, one-piece frame that is simpler, cleaner, less hingey, and more integral and appealing. And the operations mentioned become very quick and natural, once you've gotten a little practice.)