Even EeZeBilts need some protection - indeed often more as the hulls are usually balsa. But their boxes have to comply with the EeZeBilt formula, which is: Quick, Good-looking, Cheap, Simple...
Here I present the 'EeZeBox', which I use for all of my boats. It is made of Twin-Flute plastic sheet, sometimes called 'Correx'. This is often used for signage boards, and you will find it in Builder's Merchants, as it is used for protecting floors during work. It is cheap, easy to cut and bend, strong, completely waterproof and ready-coloured in a variety of shades. I chose mustard yellow! I have a rather wordy description of how to make one here: http://eezebilt.tk/box1.html , and enclose a pic of a 40" box carrying a boat and radio weighing about 20lb. Note the way compartments can be created. The boxes themselves are so light they add hardly any weight.
They are designed to be stackable - see the pic of the top of a typical wardrobe at EeZeBilt Central - and, because the boats can be supported from all sides, they can even be stacked on end. Though I haven't tried it, I suspect that I could wrap brown paper around one and send it safely through the post. Costs vary depending, of course, but a typical EeZeBox uses less than £4 worth of Correx. And I have had young kids sitting on one at the poolside...