Camp beds are mostly all the same shape as the design has changed little over the years and it is usual made of metal or aluminum , to save weight, and topped by a canvas or heavy duty nylon which can be cordura. There are some made of wood but these have mostly disappear.They are basic and do not have springs but can be comfortable and still give the sense that one is camping. To-day they are used in refugee camps all over the world such as in the middle east
Camping is sleeping out in the open or in a shelter usual a tent. Activities outdoors is now big business and is participated by millions of campers. On African safaris cots are used and these are very luxuries affairs and not like the basic bed.
A camping bed is a great light folding bed used for camps where a bit of comfort is needed. A small mat can be placed on the cot to make if even more comfortable. The camp beds are made so they are very portable and easy to erect and fold away. It would be pointless have a large sleeping area, that weight a ton, on a trip. of course, that is one of the main advantages of a camping bed being light and easy to transport around.
This type of design has been used on campaigns for centuries by armies and most of the officers had such a sleeping arrangement. It is thought the Roman legions had such items and the rich officers would have them transported around the country.It is not clear if the troops were issued with them. All sort of originations use them such as the Scouts or Cadets. As an emergency bed they have no equal as they can be packed up and flown to anywhere where people are in need of them.