Leak-proof drinking bottle with innovative One closure. The Sigg WMB One drinking bottle is the ideal companion for all leisure activities and school. With the One Top closure, the water bottle can be operated with one hand: this applies to carrying, opening, drinking, closing, and securing the bottle. Additionally, the drinking bottle is suitable for carbonated beverages. The wide opening aids in cleaning and filling the bottle. It is leak-proof, keeping your backpack dry even during more active moments. The drinking bottle is robust yet lightweight. The inner coating ensures a neutral smell and taste of the beverage. The children's drinking bottle is made from food-safe materials and contains no harmful substances, including phthalates or estrogen-active substances.