Keep extra bulbs in a clear plastic bag in the same container. (styleathome.com)
In my estimation, this is nothing more than a scam to sell extra bulbs and double fixtures to people who don't need them. (petbusiness.com)
Don't forget all the little necessities like extra bulbs for projectors, laser pointers, batteries, overhead projectors with transparencies and markers, microphones in large rooms, and everything else we have already forgotten but that you are already thinking about. (sciencemag.org)