I bought this kettle for my Trangia 27 duossal stove. This kettle fits inside a trangia 27, the gas burner fits inside the kettle too. However the Trangia pot handle thingy will not fit inside kettle or on top for storage.
Either shortening the Trangia handle or cutting a bit off the spout of the kettle should fix the issue so it all nest together nicely.
10/10 definitely recommend for Trangia 27 users