This is the only chance I will ever have to know more than Q about something. We Canadian posties handle packages much larger than a CD, up to 3 pounds and/or 200 cubic inches--anything larger goes by truck. You'd be surprised at how many packages measure up at 2 pounds 15 1/2 ounces and/or 199 cubic inches. In some towns and cities we use a system such as I described in my first post above, with two letter-carriers working out of one small van and delivering all parcels no matter how large. This system saves the PO money on cab-fare and fees paid to the private contractors who would otherwise be delivering large parcels and the relays of additional mail with which the carriers resupply themselves every half hour or so.