Oops, only just saw this, sorry Jim.
The A-Lite isn't height adjustable like the STI, but it does have slightly more headroom than the STI at its 'normal' setting. That was a good thing for me as I'm quite tall. I can sit on a chair/bedchair in the bivvy and not have to stoop like I did in my old bivvy.
I don't own a quiver so I can't be certain, but I would say yes, the A-Lite would fit in one. It folds down into a bag which is about 4.5ft(ish) high and about a foot (maybe less) in diameter. I'll measure it properly when I get the chance. The overwrap folds into a small bag.
There's actually very little to choose between the two to be honest. The only reason I ended up with the A-Lite is the extra little bit of headroom and the fact that you can fold back the front side panels to reveal mosi-mesh panels. I find these useful so I can see my rods when lying on the bedchair.
Here's a video which will help you get a clearer picture: http://www.youtube.c...h?v=XRfc2NFGiH0
And those who were seen dancing were thought to be insane by those who could not hear the music