I can totally relate to the situation because I always pack a trash bag in my luggage for the very same purpose. Now, I'm rethinking how I might avoid a similar occurrence.
I've found some gorgeous laundry bags from West Elm (shown in the photos above and below) that would easily slip into a suitcase and look appealing once home as well.
But, I'm also inspired to sew one of my own. Laundry bags are so simple ... similar to making a pillowcase with a drawstring. The fabric choices are limitless.
Another laundry bag caught my eye on Etsy. This one has great vintage (hamper style) charm and looks like a easy weekend project to me. Now, I just need that open weekend to start my stitchery.