An organizational must if you're sharing a bag.
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Pack it Cube Demo
The Cube series is a really great way or organizing your bag. I travel for a living and the cubes keep everything where I want it. I use a cube for socks, another for my surf trunks, polypro long underwear, etc. Get a variety of sizes because different sizes will get used for different things depending on length of the trip. I believe an added advantage is airport workers have a harder time lifting your stuff if they have another layer to go through.