icebox liner 78 which is also of glass reinforced resin construction and includes a bottom 79 four upstanding walls 81 83 85 and 87 and has an upper rim 89 the liner 78 is preferably fixedly attached within the center compartment 62 but may alternatively be removable therefrom in the preferred embodiment of the invention the rim 89 of the icebox liner 78 is adhesively attached to the top section 56 within the access opening to the center compartment 60 by adhesive resin and the liner 78 is surrounded by a layer 80 of thermal insulating material which may for example be a foam material expanded in place the upper surface of the top section 56 is inclined upwardly toward the edges of the opening of the center compartment 62 and includes a rear panel 82 which slopes upwardly and forwardly from the central portion of the rear edge of the top section 56 where it joins with the corresponding upper edge of the rear wall 50 the rear panel 82 is spaced rearwardly from the rear wall 81 of the icebox liner 78 far enough to permit installation of instrument indicator housings 84 the housings 84 are preferably sealingly fitted into appropriate holes provided for that purpose in the rear panel 82 to preserve the overall watertight integrity of the utility container 10 each of the right and left end walls 52 and 54 extends slopingly upward and outward from the bottom wall 48 and is downwardly concave toward the respective longitudinal frame member 22 or 24 a.