I use a "pac-a-seat" originally made for steel players. Mine is ~20+ years old and going strong. I store frequently-used small items inside it. Mine was an "original" model, was just the right height for when I played pedals; even though I don't use pedals often anymore, I still like the seat.

Similar to these:
http://steelseat.com

Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys