I made the soap saver bag in the picture here. It was super duper easy and fits my soap bars perfect. I am going to make one that is shorter also that we can use for putting the soap 'ends' in so they don't get wasted. I based it pretty closely to the pattern found in the link.
You are correct in saying they are quick. I did a couple of rows before I fell asleep. Then finished it right up in the DR waiting room. Probably only took me 1/2 an hour all together. Its nice to do something that is pretty close to instant gratification sometimes
These soap saver bags are really cute. I have never used one. Do you just use them like a wash cloth then hang them up? Do they dry fairly quickly, and is that how they protect the soap? I like the idea of putting the soap 'bits' in one to avoid waste.