Collapsible models can be useful in cramped spaces.
Collapsible umbrella is very handy as an alternative to a poncho.
Sheets of mica are used as a surface for painting, especially in India; for lantern slides; for carrying photographic films; as a protective covering for pictures and historical documents; for mounting soft and collapsible natural history specimens preserved in spirit; for the vanes of anemometers; mirrors of delicate physical instruments; for various optical and many other purposes.
Renting a collapsible stage is an option for areas where the land does not offer a natural rise.
Air draft should be no problem, providing the Dutch Barge has a collapsible wheelhouse, which most have.
