Chairs that aren't accomodating to stretch sitting or stack sitting

Hopefully in time we'll all be looking "odd" and it won't be so odd any more!

Having implements along, be they cushions or jackets, is handy given how poorly most chairs are structured.

Boy, I agree with the lack of 'good' chairs. I travel enough that I have taken to bringing a towel along to use on the plane. I roll it and put a rubber band around it, then try to hang it over the seat so it replicates my car seat towel.

I started bringing a yoga mat around with me.  I found that I could usually modify even the worst chairs, like movie theatre chairs or lecture hall chairs.  It served as a fine wedge for stacksitting and if I wanted to stretch sit, I could fold it up thin like a towel and hang it on the top on the chair like a stretch sit cushion.  The rubber yoga mat gave great traction, and it was bulky enough to make up for even deep buckets and all sorts of painful designs. 

People give me weird looks about it, and they always ask excitedly if I am doing yoga -- They get very confused when I tell them that I'm not.  Also, especially with stacksitting, you really stand out in a group of sitting people, as you are going to be taller and farther forward.  This is a bit awkward but it is worth it to me.