After getting about 90% done on the build up of my foamboard/pvc jet pack I scrapped it (well, put it aside for possible use later) and started all over again.
This time I went with almost entirely cardboard. The ONLY thing in this pack that is not cardboard are the fuel cells which I used PVC Pipe for (Central Vac pipe to be exact .. very thin and very very light) and the straps.
It still needs a few touch ups on the paint job, details and weathering but not bad for a total of about 26 hours work and $50, paint included!
Total weight is about 4.5 pounds.
Materials used : Cardboard (mail stiffener boards), Central Vac Tubing, contact cement, spray paints, straps and plastic connectors.