So much goodness here.
“Soft inflatable fun.”
“Inflate Blade by blowing into valve with mouth.”
“Pinch the valve at its base with your fingers…”
“Draw rigid end of blade into collar until it fits snugly.”
You’ll notice that fake Darth’s sword trembles with flaccidity, while fake Luke’s (with Leia’s hair?) sword is erect and turgid with the Force!
(Images via eBay)
2 Warps to Neptune 
This was the knock-off lightsaber I had. It was short, but glowed in the dark. I remember the packaging was a long piece of cardboard it was twist-wired to, but not what it looked like. http://www.womprat.com/images/Bootlegs/SpaceSword.JPG
Ah, a better image and at least a quick description: http://www.worthpoint.com/worthopedia/vintage-toy-box-inc-space-sword-glows-405909437
Yes, there was also a Space Shield that the sword fit into.
http://plaidstallions.blogspot.com/2013/07/space-shield.html
The manufacturer of Star Sword should’ve sued George Lucas for stealing their idea.