I also have a Correcting Selectric III and to say that it's not very portable is as much an understatement as saying a boat anchor is not very slim or lightweig

I also have a Correcting Selectric III and to say that it's not very portable is as much an understatement as saying a boat anchor is not very slim or lightweight! For actually portable typewriters I've really enjoyed my Royal Mercury and Smith-Corona Skyriter, both of which are usable on a lap on a bench (or under a tree).