I started making this because I wanted to practise basic sprang, and wanted to try the "endless" circular setup, where you basically work one closed loop. As you can see on the photo, I totally botched the start, where the structure is much more loose than it should have been. The start is not right at the bottom of the thing because I also managed not to push both sides in completely evenly; it thus slipped to one side of the thing.
The project was successful insofar as I really got in a lot of practise with the basic move... and successful again as at the end, I got to learn how to do double-layered sprang (yay!) and try out methods for doing the last few rows.
And now it's finished. It is quite stretchy, so it will eat up a lot of things - though they can be awkward to get out of it, because it's so long. It has been used successfully already to carry glass to the glass container:
Quite a few more would have fitted, but that was all we had to carry to recycling.
This is how it looks stuffed full of cushions:
So... learning-wise, it was a good thing. Bag-usability-wise, jury's still out; because the relaxed state is such a narrow tube, large things won't fit through the opening easily. It still does seem useful, however, and on the plus side, when you're done carrying things, or when you want to bring it along clandestinely, it can be worn as a summer scarf:
...and that makes it definitely the weirdest bag I have!