The signature SIGG bottle which was honored by MoMA (Museum of Modern Art) in 1993. Sigg aluminum bottles are eco-friendly, resuable, and 100% recyclable. Even the baked on exterior is solvent-free and eco-friendly. The Sigg interior lining is a micro-thin enamel that has much less chance for bacteria build-up and it's resistant to fruit acids and evergy drinks. The lining remains flexible, crack resistant for the life of the bottle so your drinks always taste like your drink. Sigg bottles exceed FDA requirements and have been independently tested to prove 0% leaching.