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When you have old underwear or bras don't toss them out. Wash them and put them in your suitcase, they will be there when you pack. When traveling, wear them and throw them away. That way you got one more wear out of them and won't be packing dirty clothes home. This makes more room for souvenirs
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.