Made from tritan™, Bbox's unique big-kid water bottle is ideal for preschool and school children. Its unique triangular shape is specially designed for small hands, making it easier for children to hold. The push button opens the lid and keeps the straws hygienic when closed and never misplaced. Splash-proof valve straw cap prevents accidental spills. The sturdy handle makes it easy for children to carry and take out of their school bag. Its 450 ml capacity and inclined silicone straw allow children to drink until the last drop and stay hydrated throughout the day. Minimal parts and very easy to assemble/disassemble and clean. It is dishwasher safe (top rack only). Plus, you can customize the look with the removable bumper.