Carry two pillow cases with you when you travel. Use the first to put your dirty clothes in (assuming you don't have access to a Laundromat) and place the second pillow case (if you're in a hurry) between your dirty clothes from the night before and your clean clothes.
We bought some inexpensive mesh drawstring bags from Wal-Mart and we take one or two along on trips for putting our dirty duds in. Never even thought of using a couple pillow cases which indeed is more frugal. The mesh bags tho with the drawstring closure are nice because even if they are over-stuffed, your things do not fall out once you pull the string closed.
I learned this the hard way. Years ago we had a camper and the first week-end we went camping I put our dirty clothes in a garbage bag. At the end of the week-end all garbage was dropped off at a designated site as you existed the campground. I'm sure you can guess what happened--the bag containing the clothes went will all the other garbage bags and gone were our clothes, which I didn't realize until we were home unpacking. After that, dirty clothes went into a pillowcase, not a garbage bag!
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