Thanks to http://www.instructables.com/member/thehaggard/ for ‘Sketch Journal with Holders’, it was the inspiration for this re-usable adaptation.
Step 1: Materials and tools
Webbing 3cm wide (I used the strap from a discarded camera bag)
Elastic 3cm wide x 22cm long (also from the discarded camera bag)
Straight pins or chalk/pen for marking the webbing
Sewing machine (or a needle, thread and thimble if you have the patience)