How much did the Radio Shack TRS-80 Model III weigh? I imagine it must have been quite a lot, with the computer, monitor, power supply and up to 2 disk drives all in the same case, but I haven't been able to find an actual number anywhere.
An old acquaintence of mine that I used to buy a fair bit of kit from (and hope to again, possibly a Model 4 if he can source one) informs me that the TRS-80 Model III clocks in at about 20kg, boxed up. That's about 44lbs for those quaint people not wholly converted to metric :-)
I can't imagine the box and packing itself would be much more than a kilo or so, so I'd put the weight of the computer itself in the high teens.