Swiss offer to buy for 400 euros, and we are to make an alone clamshell of 7 mimyllimeter cardboard.
Zigzag profile resembling a card house, reinforced with a woven ribbon or braid passing from one end to another. From above, designers advise to lay a mattress or futon, for which the horizontal folding support is additionally provided with the same thick cardboard.
"Picture" bed-folding beds.
A source