Convenient: Compact size and light weight make it an easy fit for pockets, purses, makeup bags, and pouches. Safe Material: Our lip balm container tubes are made of food-grade plastic, odor-free, BPA free and non-toxic. Leak-proof: Each lip balm tube comes with a cap and features a twist-up bottom. An included cap ensures mess-free storage, and the twist-up bottom provides easy dispensing. Note: Max recommended filling temperature is approx 120F (49C). Filling with a solution that is too hot can warp the plastic & damage the mechanisms. Containers are not "water tight", so pouring too hot can also cause leaking (until the formulation solidifies). If the solution placed in them is too thick or pasty, the twist mechanism cannot freely move product up and down.