|This works well for me as I like to keep my patterns in their original envelope with no loose strays poking out.
When finished with the project, I layer the pieces of the pattern tissue, beginning with the largest on the bottom.
Then I use the instruction sheet, folded as it was originally, as the guide for getting the tissue bundled just a bit smaller than the folded instruction sheet.
Once folded, use one of the pattern instruction sheets as a "taco" with the tissue as the filling and slip all back into the envelope.
The envelope will not be a 100% as flat as it was new, but all the pieces will be enclosed for the next time it will be used.