This reminds of the millions of dolllars the Yanks spent developing a ball point pen that would work in weightless conditions on their spacecraft.
The Russians pondered the same problem, and decided a humble pencil would do the job just as well!
Useless items - I weighed my flight bag a couple of years ago, it was 14 lbs! Full of the stuff I never use anymore. (Flying helmet and parachute are in separate bags, and see different thread about flying suits!)
Most useful item - my credit card (and it must weigh less than an ounce).
RD
