Aithre bottles can be self-filled using another aviation portable oxygen tank as a supply source and the custom MH-Aithre transfilling hose. This allows use of a fixed rate FBO fill of a larger aviation oxygen tank to be spread out over many fills of the Aithre bottles. This provides a low cost way to keep a constant supply of super portable oxygen instead of consuming disposable oxygen canisters with their very limited oxygen content.
MH has taken the time to prepare transfilling instructions for the Aithre bottles using the MH transfilling hose. And for all those visual learners, Zu has prepared a video showing how easy this process can be. You can watch the Aithre transfilling video here.