I use these when traveling due to the space constraints. The containers are easier to pack in a toiletry bag, and take up virtually no space. They have not leaked on me yet, and I have smashed them into some odd spots. I use them for my shampoo, conditioner, and face wash. I also like the fact they take up less space as you use the product inside, and you can push the air out so even when you're running low, you do not run the risk of the product drying up and becoming un-useable before the end of the trip.