Fifteen years ago, I bought a folding hunting seat to use in the marsh. It had 4 steel legs which made it easy to lengthen the legs 4" to keep my butt out of the water and to make it easier to stand up to shoot. Last year, after many repairs/reinforcements I finally retired it (it rusted like crazy). I purchased a new, aluminum-framed chair from Gander Mt. this summer and, learning from my experience with the original seat (and the modifications made to it over the years), turned it into a mad marsh seat.
It weighs about three pounds and is easily carried in my boat, then set up in the tules. It is used in conjuction with a holder made of wood that spikes into the mud in front of the seat that holds my blind bad and gun. Makes it real easy to put out decoys and have quick access to shells, snacks, binos, etc. while keeping it all out of the water.
The main advantage of the hunting seat is that it has a back on it. Sure is nice to be able to lean back against something during those long afternoons waiting for the evening flight. Believe me, it makes a difference.