When you have used up and removed an old inner tube, don't just throw it away (by the way - there really is no "away" - it has to go somewhere), make use of it for something else such as:
Slice into thin strips and use as elastic bands.
While not quite as elastic as a real elastic band, recycled inner tube elastic bands are tough.
If you buy a Brompton inner tube (QTUB) from us - then you will most likely see these in action - for free.
And best of all, when you run out of old inner tubes for cycling - just visit the bottle bank and ride over all the broken glass - that will help you get another old inner tube ready for recycling!