>>The payload on something like mine is only a few ounces but there are obviously bigger, more expensive, options. Amazon are supposedly trialling them as delivery vehicles.....
>
>http://www.dailymail.co.uk/sciencetech/article-2768128/Send-DRONE-doctors-Parcelcopter-fly-medicine-urgent-goods-remote-German-island.html

Hmm. I see the DHL version has a payload of 1.2kg.
Interesting inset there about the Facebook solar powered drone. Size of a 747 and operating at 60,000 ft....