configuration as the cover 14 and over which the cover 14 may be disposed through a slot 29 fig5 in the end wall 20 which is shown closed by a conventional slide fastener 30 fig2 the inner liner 28 forms a generally rectangular closed sack which may be made of a liquid impervious fabric or monosheet to define an interior space 32 fig3 which may be at least partially filled with a substantial quantity of small plastic beads 34 and 36 the beads 34 and 36 are preferably formed of expanded polystyrene foamed plastic and are a mixture of beads having a diameter ranging from approximately 0 062 inches to 0 188 inches in diameter being generally spherical in shape and being formed with a substantially fluid impermeable outer surface the interior space 32 is filled to approximately 50 of its maximum volume with a quantity of beads 34 and 36 and the generally rectangular shape of the liner 28 and the cover 14 allows a sufficient flow of the beads to present a suitable contoured depression in the top panel 24 of the cover to provide improved support and containment of an infant child generally designated by the numeral 38 the.