This: A Portable, Flexible and Affordable Cardboard Standing Desk over at the site Design Milk, is a great design of a desk that not only is capable of transforming from a typical to a standing desk, but is also capable of being packed up and easily transported to different locations. For standing desk fans that travel to different work locations, it might be just the thing you need.
It’s strong too. Check out the link above and see what this piece of furniture can do. Impressive.