Ah, I shall use wooden curtain-rings such as are used on my bag, to make it into a back-pack if wanted, or a shoulder-bag. It’s a very clever design, and one she’s admired once or twice. The strap (something between fine and six feet long) goes from tied to a ring fixed to one bottom corner, up to and through a ring fixed on the opening of the bag, in the middle of one side, through eight more rings fixed round the opening, back through the first ring at the top and then down to be tied to a ring on the opposite bottom corner. When it is in use, the rings are pulled together and close the top of the bag. If the strap is long enough, it can be worn over one or both shoulders as one pleases.
I was thinking of thick curtain-cord, the twisted sort like rope.