Tip: Put your bedsheets and second pillowcase inside the first one for storage.
Question: Why would I ever want to do that?
Theory: Keeps everything together, no spare pillowcase to get lost.
Rebuttal: I hate this tip. I even tried it once and cannot make it work. I have an absolutely lovely friend whose life has been completely renewed by now stuffing her pillowcases in this manner. I think what drives me nuts first of all is that it makes just an unsightly lump of sack-filled sheets unfit for stacking and better equipped for stuffing into an already packed closet shelf. Furthermore, my pillowcases are apparently too long and end up having a tail (do I fold it back under or do I just loosen up the whole package and let it ooze out over the shelf?), becoming the very antithesis of a neatly folded pile. I also must question the obvious... how do pillowcases get lost on a closet shelf? If they are removed by someone needing a clean pillowcase then it is just as possible to lose one housed in a pillowcase-sack as it is in a pillowcase-pile. The return of wayward single pillowcase is just as easy (and dare I say easier?) to a stack than a sack. Finally (and this moves beyond a deep thought to a deep-seated issue), by having all of the sheets inside a pillowcase, the pillowcase is open and exposed, most of its surfaces touching and being touched by any manner of objects. Completely negates the freshness factor a tightly folded pillowcase can bring to a newly dressed bed.
Solution: After laundering a set of bedsheets and pillowcases, fold each item as neatly as you prefer, place altogether in a stack (prodigal pillowcase option: sandwich folded pillowcases in between the flat and the fitted) and stuff as neatly as preferred into whatever space is available on the shelf.
Warning: If you ever stop by for a visit, don't open the door to my linen closet. You may have a pile of sheets fall out neatly on your head.