(alternatives - corrugated polypropylene, plywood/leather)
2 layers of corrugated board around the object,
except seat (5 layers) and back (4 layers in the upper part)
with grooves going in perpendicular directions (vertically and horizontally).
price of the cardboard prototype - about 3$ including glue.
testing. 3 prototypes were thoroughly tested at several parties (see photos).
3 protos were easily put in a luggage boot of a compact car.
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