Klean Kanteen's 100% leakproof Flip Seal Sport Cap comes with an ergonomic spout that opens and closes with just a flick of the thumb and can be used with or without a stainless steel straw for maximum versatility so you can stay hydrated your way. 

Features:

• Straw NOT included
• 100% Leakproof
• Easy open spout
• Ergonomic design with steady flow rate
• Can be used with or without internal stainless steel straw
• Compatible with all Klean Kanteen Single Wall and Vacuum Insulated Classic bottles
• Recommended for kids ages 3+
• Dishwasher safe
• BPA Free