Clever plastic adaptor that allows you to use Bluet type pierceable gas cylinders on screw-threaded gas stoves. Needless to say this is invaluable in areas where screw-threaded gas cylinders may be hard to find, such as some third world countries and remoter parts of the alps. It could save you money too.
This is more bulky but a little less fiddly than the Edlerid version.
275g.