Made of premium titanium, it is lightweight, never rust, anti-corrosion from acid and alkali, scratch-resistant and heat-resistant. Titanium is a human-friendly metal, the oxide layer on the surface is antibacterial, which made it not easy to react with substances, so it can maintain the original taste of drink. Ultra-light Combination. The 1050ml Bottle & 600ml Nesting Cup Set were designed so the bottle nests inside the cup for convenient and compact storage. 600ml capacity, this titanium cup can work as a little pot and big water cup, meet most of the needs. It can be directly heated to boil water or cook food. They are very light and convenience to carry it everywhere. 1050ml Wide mouth bottle, very easy to to fill in and pour water. It adopts internal thread structure, built-in silicone ring, super seal, prevent water leakage. Both the bottle and cup can be heated directly on the stove, It can be filled with hot water or heated directly on the stove. Convenient and efficient, you don't need to bring other boiling tools when you go camping. Comes with 2 storage bags that helps you store the cup and bottle to prevent wear. Super lightweight, compact and portable. You can easily carry them in your camping, hiking, backpacking trips.