According to Official Guinness Records,
The largest display unit measured 1,385.88 m³ (48,941.8 ft³) and was achieved by Gillette Italy and Procter and Gamble S.r.l. (both Italy), in Rome, Italy, on 9 July 2011.
The largest display unit measured 12.15 m (39 ft 10 in) in length, 8.15 m (26 ft 9 in) in width and 18.97 m (62 ft 3 in) in height and it was an exact replica of a Gillette ProGlide display unit measuring 1.215 m in length, 0.82 m in width and 1.795 in height. The actual volume had been calculated and adjusted to reflect the irregular shape of the display.
For a complete list of 2011 records, please visit 2011 Guinness Records in Italy.