First of all, thanks for bringing this to the forum.
I downloaded the PDF in put it in my "Preparedness" folder.
I plan to print it and laminate it, along with a similar illustrations of lines and
knot tying.

I agree with you that its a useful skill to have and grist for the mill considering
the nature of this particular forum.

I can't picture anyone from this forum community relying on flimsy plastic shopping bags for their cherished and expensive preparedness gear so I think some people here are missing the point.

Thanks for the posting.