Abstract: The unit comprises a tray (3) carrying block-shaped cartons (1), arranged in rows (6), in which electric lamps (2) are accommodated. A wrapper (10) having a closure is folded about folding lines (11) so as to surround a base wall (4) and first side walls (5a) of the tray (3), and the side (7) of the cartons (1) remote from the base wall (4). The wrapper (10) encloses the package (1, 3) with clamping force. The unit has important advantages such as easy packing and unpacking, small material requirement, and visibility of the contents of the wrapper. A sticker (42) may be present over the closure of the wrapper, indicating that the wrapper has not been opened. A sticker (42) in combination with flaps (45'), which are integral with second side walls (5b) and fastened to the first side walls (5a) of the tray (3), and in combination with recesses (40) in the wrapper (10) with which the flaps cooperate, provides an indication that the contents of the unit have not been tampered with.