Whenever you can, leave beauty products and toiletries at home. If there are lotions and potions you just can't live without, stick with the travel-sized containers: They save space, and you can reuse or recycle the packaging when you're done. If you're a fan of planning ahead, call your hotel to find out which toiletries will be stocked in your room when you get there. Make sure to distinguish between what's provided gratis and what you'll be charged for on your bill -- you don't want a case of sticker shock over a couple of miniature soaps.
You can find travel-sized shampoos and other products at your local drugstore, but we like to window shop online at sites like as 3floz.com. You can find high-end products in cheap, pint-sized containers, which will help you save space -- and get your carry-on through airport security.