There have been worse, but cannot find links at the moment. I think it was when you purchsed the upgrade from Windows 95 to 98 from Microsoft, you were sent a carton big enough to contain a football. Inside was a Russian Doll-like series of smaller cartons and bubble-wrap, and eventually a paper voucher that could have been sent in a standard letter envelope. You took the voucher to your local computer shop shop for the upgrade CD itself. Some people took days off work to receive this parcel.
Even worse was a HP printer upgrade circuit card, about 2 inches square, that was delivered in a carton the size of a tea chest on a fork-lift truck pallet.