Use instruction:1. Take the drinkhole lid off the bottle and leave the hour-glass-shaped blending spring in.2. add the content you want to mix into the bottle.3. put the drinkhole lid on and screw it tightly. 4. Push the flip of the drink hole down firmly to close the drink hole.5. Use one hand to hold the bottom of the bottle, the other hand hold the upper part of the bottle with one finger covering and holding down the drink hole flip.6. Shake it up and down to thoroughly mix the content.7. When the mixing is completed, open the flip of the drink hole first. 8. Pressure might develop during the mixing, especially for hot content, make sure do not point the drink hole to your face or other people.