The Heatsheet blanket is the same size a mylar sheet blanket, the bivy rolled up is about the size of a clementine.
And I don't think you'll find a lighter like what you are describing- there would be safety concerns that would probably bar it from being sold in most of the Western world. At least when you are talking pocket sized; get into things like blow torches, there are different factors.
And what you are describing with the "pull tab and drop" type of fire starters are probably closest to the half sized Orion hand flares that I used to see occasionally. Basically, a 5 minute road flare, about 3.5-4" long.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.