optimus 123As are the canisters for my old Optimus 721 stove, Gaz Globetrotter stove, and Bluet 200 stove. When canisters become obsolete the stovesThe svea stove from Optimus has been the go-to lhtweht white Gas (naphtha) stove for lht-and-fast climbers, alpinists, mountaineers,