Well, this thread has certainly been an entertaining read, now I just need to build one! I have a backpack frame, a smallish keg (maybe 1.5 gallons) for the tankish shape, and other bits and bobs... I shall have to undertake this endeavor and hopefully not blow my shop up this time.
Miphet, in regards to the catalyzed dihydrogen dioxide steam generation, I have mechanations to harness this steam in an alternate method than rocketry and utilize the large amounts of steam produced to operate a functional steam powered motorcycle... Not to get too far off topic.

(Edit, add picture)
Well, I made a rough sketch of how I wish my pack to be. I already have the keg, now it is just a matter of getting the rest of the fittings.
