The concept is simple, a highly portable strap that goes around your legs and back as you sit, and provides back support, but can be thrown in your backpack/purse/pocket and carried around. I think it's brilliant! You can use one of these on the floor, on the ground, on a couch or chair, or anywhere else where you want a little more back support. The only downside is that my rear end gets a little sore from this. I think I will add to it by taking a small piece of closed cell foam around as a seat cushion.
Step 1: Materials
2" Webbing: 2-2.5 yards
1/8" or 3/16" Shock cord: 6-8"
2" "Loop Loc": 1
2" Tri-glide: 1
Optional- Small piece of leather or cloth
Needle and Thread
Sewing Machine is nice
Something to cut webbing and fabric/leather
I used Tubular Nylon Webbing, I would recommend against that, because it is significantly bulkier and heavier. I'd suggest either polypropylene, or if that's not available you could use flat nylon. Really you could use anything. This could be done with seat belt webbing and a buckle from an old car and look much cooler than mine.
You could also use a variety of other options on the buckles, I just wanted something that could be adjusted and this stuff was handy. Also for mine I used 1/4" shock cord, I would recommend using lighter weight shock cord (actually the shock cord is optional).
All of these materials can be had from a variety of retailers, some of my favorites online are: Outdoor Wilderness Fabrics and The Rainshed.
I apologize for not having pictures of the whole process. Please let me know if there are any other pictures that would be helpful!