Well, I used to use a folding tripod stool but apparently my big butt is mightier than the stool...
Now, I sometimes use Dean's seat (with my pad on it)
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... but find that it hurts a bit. I think I need to make another with slightly deeper dimensions (I'm 6.4" and 12x12 just isn't making it for me).
Sometimes I use a folding lawn chair (no pic of that at this time) with some para-cord arm straps. It works fine, but if I plan to do any walking, I leave this one at home - to clunky.
Mostly I just sit on that pad on the ground. As to making too much noise getting into a shooting position - try shooting from the ground. Turns out I shoot about as well from my butt on the ground (sitting cross legged) as I do standing.
That may be some commentary on my standing shooting but shhhh.
:-)