So I se about making the ditty bag from "Sail Makers Apprentice". I had a few goofs, and I could not easily source brass thimbles, so I just whipped the cringles instead.
Given the length of time it took to make a simple canvas bag, I am quite glad that I simply bought my sails rather than tried to sew them up by hand.
It was very hard to make up a grommet in polyester the size of the bag. Retwisting the strands as you go is a must.
You also need to use some sort of bobbin to wrap the whipping thread around or it will take all day to do cringles and loops.I am considering waxing the canvas so that I can actually use it rather than just have sit on a shelf. It's full of sail sewing kit right now. Hopefully I won't ever find myself needing to make repairs to get me home. I also think that I will get a big roll of self adhesive sail repair tape too.