A container constructed and arranged to be connected to other containers is provided. In an embodiment, the container may comprise a container portion with an opening into an interior space in which articles to be transported can be stored; a lid for closing the opening; a handle for carrying the container; a front latch for securing the lid to the container portion; and a pivotable side latch, pivotally connected to the lid, that is moveable between a retaining position and a storage position. The pivotable side latch may be configured to engage a retaining structure of another container when the pivotable side latch is in the retaining position. The lid may comprise a depression, and the pivotable side latch may be further configured to be in the depression when the pivotable side latch is in the storage position. The container portion may comprise a retaining structure with an upward-facing lip that is configured to engage a pivotable side latch of a further container to facilitate securement of the container with the further container.

A hand truck includes a main frame unit configured to carry an article, two spaced-apart clamping arm units pivotally disposed on a bottom end of the main frame unit, and two elastic restoring members connected between the main frame unit and one of the clamping arm units. The clamping arm units are driven to move relative to the main frame unit between a clamped position, in which the clamping arm units are moved close to each other for clamping therebetween the article carried by the main frame unit, and an open position, in which the clamping arm units are moved away from each other. A step mechanism is pivotally disposed on the main frame unit, and is configured to be stepped on and pressed down by a foot of a user to drive the clamping arm units to move toward the open position.