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. brushed stainless steel water bottles have no coatings inside or out and wont leach smells or flavors. Large 1.75 inch (44 mm) opening fits ice and is easy to fill and pour. Comes with SPILL PROOF Sport Cap 3.0 with SAFE and soft silicone spout. COMPATIBLE with all Klean Kanteen Classic caps. All Klean Canteens 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.