Portable Vacuum Insulated Double-Walled Water Bottle Flask for Cold or Hot Beverag Twist-Free and No-Screw Insulated Flask

● Fully open and close its cap with one hand in under 2 seconds

● Has a ring which you can hook your index finger through for single-handed use
● Double seal with preset evenly constant pressure applied, leak proof
● Double wall insulation keeps cold beverages for up to 36 hours and hot drinks for up to 12 hours
● Matte finish and powder coating exterior surface, no-slip and easy grip handling
● Wider mouth, easy to clean and put ice inside
● Fits for most car cup holder
● 20 ounce size is great for hiking or outdoor activities to carry in a backpack.