Each Sigg bottle is a piece of top Swiss craftsmanship for exploring the world. This high-quality, recyclable aluminum bottle is extremely light, robust and can be comfortably carried with one finger even the 1 liter version. It is 100% leak-proof even with carbonated drinks. The material is free of harmful chemicals, such as estrogen-mimicking substances and phthalates. The multi-layered inner liner holds up a lot of stress (eg bumps) and guarantees a safer drinking enjoyment.