Don't mean to be a hard arse, (no pun intended lol) But um.. couldnt u just take a couple of pillows ?? leave the office @ home for a few hours ??
Bad enuff lugging a rig+monitor+inputs+food/watever .... let alone that $300 erganomic geek throne lol.
each to their own i guess...
Personally, i've gone 12 hours on a milk create under a table and still managed.
" A WHOLE PLASTIC CHAIR!!? U MEAN IT'S GOT A BACK SUPPORT!!!!?? - SHIIT SONNN THATS QUALITY!! "