Humangear GoToob Refillable Silicone Travel Bottle

These tubes have a handy locking system, they open wide for filling, and have an inner cap that squirts so you have control of the amount of product you're dispensing. They clean up easily and come in several colors so you can distinguish one item from the other. I have leave-in conditioner in mine, but I've used them for a variety of different liquids. They hold a full 3.4 oz (100 ml), which is the acceptable amount for airlines. GET THIS GEAR