I think I know the bag you mean. A friend made a bunch of them several years ago and gave them out as gifts. I got one, and I have used it and used it. She used pre-quilted fabric and webbing for the straps. I don't know where she got the pattern. I can't find it online.
tote at smaller size
[ATTACH=CONFIG]253335[/ATTACH]
tote expanded
[ATTACH=CONFIG]253336[/ATTACH]
inside when folded in
[ATTACH=CONFIG]253337[/ATTACH]