A casket assembly includes a floor structure, transparent side walls and end walls extending upwardly from a lower rail to define side panels and end panels, and a transparent lid attached to at least one of the side walls. A cardboard insert container made of a material suitable for cremation is sized for receipt within the enclosed casket interior. At least one of the side panels or end panels is movable between a closed position to completely enclose the casket interior and an open position to allow horizontal movement of the insert container holding a deceased human body into and out from the casket interior without having to lift the insert container over the top edge of the side and end panels.