Classic Series Sigg Bottle with Active Top. Each SIGG bottle is a piece of top Swiss craftsmanship for exploring the world. For over 100 years. An achievement we wish to honor with this series: The Classic Series. The high-quality, recyclable aluminum bottle is extremely light, robust and can be comfortable 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.