Klean Kanteen Wide Mouth Single Wall Stainless Steel Water Bottle with Leak Proof Stainless Steel Interior Cap DURABLE & LIGHTWEIGHT - Our stainless steel water bottles are made from high quality food grade 18/8 STAINLESS STEEL that won't flex when squeezed like cheap knockoffs. Lightweight SINGLE WALL water bottle design is perfect for everyday hydration when at work, on the trail or on vacation. Water bottle is lighter due to being NON-INSULATED and holds more liquid than our similarly sized insulated water bottles. LEAK PROOF & ALL STAINLESS - Comes with LEAK PROOF loop cap made from BPA-free, leach free, polypropylene #5. Cap has a stainless steel bottom insert creating an ALL STAINLESS STEEL interior so your liquid doesn't touch plastic. Food-grade SILICONE gasket ensures a leak proof seal and is easily serviceable and replaceable. EASY TO USE & VERSATILE - Large 2.125 inch (54 mm) opening fits ice and is easy to fill and pour. All stainless steel SINGLE WALL water bottle construction with no coatings means it can be used to boil water when needed for sterilization. All Klean Kanteen wide water bottles are compatible with most BACKCOUNTRY WATER FILTERS. HIGH QUALITY & EASY TO CLEAN - All Klean Kanteens water bottles go through extensive quality control to ensure the HIGHEST QUALITY materials and construction. This means all seams, threads and stainless steel finishes are smooth and easy to clean. The interior is ELECTROPOLISHED which is a safe and non-toxic process which helps with cleaning and won't retain or impart flavors. LIFETIME WARRANTY - Our goal is to REDUCE SINGLE USE, plain and simple. So we make products guaranteed to hold up to whatever life throws at them. Our lifetime STRONG AS STEEL GUARANTEE is our promise to making a truly superior product that we stand behind in the occasion you get a product that doesn't meet our standards. We released the first FULL STAINLESS STEEL WATER BOTTLE in 2004 and will be here for years to come with the best service and stainless steel bottles and products.