I had the idea to make a collapsible set about 4 years ago while living in the dorms where space is at a premium. This is my second (lighter, thinner, just as sturdy) set, as the first was destroyed by rain and drunkenness last summer (I had mistakenly lent them to a less than responsible friend for a weekend). They collapse to just over 2" thick when stacked. Everything was hand painted by my girlfriend and I. The boards are 1/2" MDF and the braces are 1/2" Birch Plywood. I also used 36" continuous (piano) hinges. Weighing in at 18 pounds each, they also can support my 187 pound body.