A container system comprising: a base unit comprising i) a base container portion having walls, including at least a first pair of opposing side walls (20a, 20b) and a second pair of opposing side walls (22a, 22b), the side walls defining an opening into an interior space in which articles to be transported can be stored, ii) a base handle, and iii) a first latch region; and a removable container unit constructed and arranged to be removably attached to the base unit, the removable container unit preventing access to the opening of the base unit when the removable container unit is attached to the base unit and permitting access to the opening of the base unit when the removable container unit is removed from the base unit, the removable container unit comprising: a removable container portion having a storage space for storing items, a cover movable between an open condition permitting access to the storage space and a closed condition preventing access to the storage space, a container handle to facilitate transport of the container unit separately from the base unit, and a second latch region constructed and arranged to latch with the first latch region, wherein the container unit is removable from the base unit when the first latch region is unlatched with the second latch region; and wherein the container handle is positioned so as to be on a vertical side surface of the container system when the second latch region is latched with the first latch region and forms a top carrying handle for the removable container unit when the removable container unit is removed from the base unit. a base unit comprising i) a base container portion having walls, including at least a first pair of opposing side walls (20a, 20b) and a second pair of opposing side walls (22a, 22b), the side walls defining an opening into an interior space in which articles to be transported can be stored, ii) a base handle, and iii) a first latch region; and a removable container unit constructed and arranged to be removably attached to the base unit, the removable container unit preventing access to the opening of the base unit when the removable container unit is attached to the base unit and permitting access to the opening of the base unit when the removable container unit is removed from the base unit, the removable container unit comprising: a removable container portion having a storage space for storing items, a cover movable between an open condition permitting access to the storage space and a closed condition preventing access to the storage space, a container handle to facilitate transport of the container unit separately from the base unit, and a second latch region constructed and arranged to latch with the first latch region, wherein the container unit is removable from the base unit when the first latch region is unlatched with the second latch region; and wherein the container handle is positioned so as to be on a vertical side surface of the container system when the second latch region is latched with the first latch region and forms a top carrying handle for the removable container unit when the removable container unit is removed from the base unit. a cover movable between an open condition permitting access to the storage space and a closed condition preventing access to the storage space, a container handle to facilitate transport of the container unit separately from the base unit, and a second latch region constructed and arranged to latch with the first latch region, wherein the container unit is removable from the base unit when the first latch region is unlatched with the second latch region; and wherein the container handle is positioned so as to be on a vertical side surface of the container system when the second latch region is latched with the first latch region and forms a top carrying handle for the removable container unit when the removable container unit is removed from the base unit.