If you're required to travel light anytime soon, check out the travel toiletries from Travelon, which come as paper thin, single-use sheets packed into colored plastic containers (think Listerine Pocket Pals). The sheets of hand soap, shampoo, conditioner, shaving cream, body wash and laundry detergent—all biodegradable and, of course, TSA-compliant—come in packs of 50, and will never spill in your shoes.
My favorite discovery was the ultimate travel toothbrush: Travelon's has a built-in reserve for toothpaste that you twist a knob to release onto the brush, like YSL's famed Touche Eclat, but for teeth. Not only that, the brush also has a cover, so you don't have to buy one of those four-packs at the drugstore that invariably don't stay closed. Pick up the sheets for $4.95 a container on Irvs.com and the toothbrush for $39.95 on Amazon.com.