Soviet Army veshmeshok back packs are really cheap and a nice big pack for those on a budget . they are low tech and very tough .
I found them for sale for only R210 at http://tacticool.co.za/shop/index.php?route=product/product&product_id=1560
video of how to tie it up http://sovietarmystuff.com/images/sidr.avi
so I came up with idea to make my own will post it soon … Should be free to make as its all from old scraps most guys will have at home…