A range of foldable casings of different dimensions to fulfil different functions that can be used as portable cradles (useful with function as insect protection casing as well such as against the Anopheles mosquito), kennels and emergency pet crates,capsule-like medical stretchers to rescue injured people in hostile situations and extreme environments, camping tents, kayaks and different types of small watercrafts as well as parachutable multipurpose tents. These casings in unfolding phase open with great ease and are made by a fabric casing or similar materials, closed as a shell and firmly connected to a frame consisting of flexible ring-shaped and arch-shaped rods. In these casings, ones opened e unfolded, all their elements can be strongly tensioned by the opposite action of fabrics, rods and internal traction elements. These casings, ones tensioned and made rigid, are then capable to support the full weight of a body on a horizontal surface located inside said casings, lifting the body's weight off the ground and distributing said weight among all other elements of these casings that, designed such way, are thus extremely lightweight and resistant.La présente invention concerne un gamme d'enveloppes pliantes de différentes dimensions pour remplir différentes fonctions qui peuvent être utilisées comme des berceaux portables (utiles avec fonction d'enveloppe de protection contre les insectes et contre les moustiques anophèles), des rigoles et des caisses pour animaux, des civières médicales de type capsule pour porter secours à des personnes blessées dans des situations hostiles et des environnements extrêmes, des tentes de camping, des kayaks et différents types de petites embarcations ainsi que des tentes polyvalentes parachutables. Lesdites enveloppes en phase de dépliage s'ouvrent très facilement et sont fabriquées en tissu ou dans des matériaux similaires, se ferment comme une coque et sont raccordées fermement à un châssis constitué de tiges en forme d'ann
