Sitting is kind of a pain the butt...

I am having some issues too. Not only have I hurt myself falling on my skates, but my tailbone hurts. I have another TMI type problem, I have loose skin that folds and pinches when I sit. I think I better save up for a butt lift.

I carry one of these in my backpack, especially when flying coach:

http://www.amazon.com/Therm-a-Rest-Travel-Cushion-EverGlade-Slate/dp/B00453N8H0/ref=sr_1_15?ie=UTF8&qid=1363661406&sr=8-15&keywords=thermarest 

I can't sit on a hard surface - and even some padded seats (especially airplanes).  This rolls up pretty small (I carry it in the water bottle holder of my backpack) and it inflates on its own due to some sort of internal spring technology.