Shower caps are great for putting your (dirty and dusty) shoes in when you travel! Chances are your shoes will get quite dusty during your missions trip activities and you don't want to spread the dirt around to the rest of your suitcase contents.
Awesome packing tip called a skivvy roll. Teaches how to save space in your luggage every time you travel. Budget travel lovers will enjoy this technique because it can mean less packed luggage (and fewer fees).