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We know that the flow of liquids out of your bottle is important.  Therefore, we only recommend filling your ecococoon water bottle to the shoulder as this will enable a small air pocket at the top of the bottle to assist with the flow. 

Our CocoonCaps have a one way valve and you will have to suck to start the liquid flowing. Therefore, if you have to really suck on the mouthpiece to get the liquid to start flowing, then your mouthpiece is on too tight, therefore we suggest loosening it ever so slightly.