the direction of their fold lines 44 54 as illustrated in fig3 or else different lengths as can be seen in the variant embodiment illustrated in fig1 the protective flap 27 can have a length taken perpendicular to the protective fold line 28 substantially equal to that of the base flap 26 as illustrated in fig3 in such a way as to totally cover it by folding along the line 28 in a variant illustrated in fig1 this length of the protective flap 27 can be less than that of the base flap 26 while being greater than the depth of the notch 33 of the covering flap 30 in such a way as to prevent any access to the casing 20 of the cradle 2 when the packaging is in the folded position the closing means gradually narrowing into a tapered shape away from the fold line 52 can exhibit curvilinear narrowing as illustrated in fig3 or straight narrowing as illustrated in fig1 the sheet of the packaging is made of a material suitable for housing the contents m for example contents of gauze tent or knit type it is therefore possible to use a material of medical grade compatible with various sterilization methods this material must protect the contents m mechanically handling humidity provide a microbial barrier in order to maintain the sterility of the contents m and generate as few particles as possible to improve the resistance of the sections of the packaging that are subjected to a stress during its opening the material is preferably tear resistant and more flexible than paper furthermore this material is preferably recyclable very preferably this material is a fiber non woven textile material for example made.