The invention relates to protective packaging of objects of a fragile nature, such as electronic components, optical components, and other delicate or fragile food objects, and comprises hollow protective container portions arranged to be positioned in a manner defining a hollow interior chamber for protectively packaging such fragile or perishable objects, with said container portions being provided with shaped inner liner parts having shaped recess portions formed in place therein in the presence of such packageable objects and at least partially engaging corresponding parts of such packageable objects, with the shaped inner liner parts comprising a multi- phase material of foamed-in-place compressible, plastic material interspersed with bubble-pack means having closely adjacent gas cells which are isolated cells. In one preferred form, each container portion is formed of laminated material of a novel high-strength-to-weight ratio type including high-strength stiffening portions and lower strength, extremely low-density, high-specific-volume filler material which, in one preferred form, includes either, associated with said panelling material and/or associated with said shaped liner parts a combustion-inhibiting material comprising particles which are preferably of a heat-responsive nature adapted to decompose when subjected to the heat of a combustion and to produce an effectively built-in fire extinguishing gas (which will also mean a fire-preventing gas), usually a halogen containing a substantial quantity of bromine and adapted to prevent combustion originating from other adjacent structures or to substantially inhibit same and to prevent combustion of the foam plastic material either in the panelling material or the multi-phase shaped inner liner parts.