I followed directions online to make my own baby wrap - it's basically just a 5 yard long piece of fabric that you cut to the right width. (babybunching.com)
Best of all, since most of these carriers are made from long pieces of fabric, you'll have plenty left over to use as a cover to give yourself and your child a little privacy. (abckidsinc.com)
Ring Slings are long pieces of fabric secured with 2 rings. (eat-sleep-love.com)