All of these items are constructed of BPA-free, food-safe plastic, which is top-rack dishwasher safe and easy to clean. The travel-sized refill tubes are perfect for airline travel as well as keeping in a child's backpack or lunch kit. They're also great for carrying in a purse or overnight bag, and storing inside a desk drawer at the office. Remember, because the Toothpaste 2 Go refill adapter works both ways, any unused toothpaste left in your travel tube can easily be transferred back into the full-size toothpaste tube whenever you wish.