Container assembly and cover and container thereof

A cover of a container assembly, the container assembly further including a container having a mouth portion surrounding an axis, said cover being configured to be detachably connected to the mouth portion of the container and being configured to cooperate with the container to define a receiving space, said cover comprising:

• a cover portion;
• a connecting portion connected to a periphery of said cover portion and including an outer sidewall that is configured to surround and press against the mouth portion and that has an end edge;
• and
• a plurality of stopping protrusions formed around said outer sidewall, each of said stopping protrusions forming an included angle with said end edge and defining a gap with an adjacent one of said stopping protrusions, each of said stopping protrusions having a highest point and a lowest point opposite to each other along the axis, the highest point of each of said stopping protrusions being configured to cooperate with a lowest point of the mouth portion to define a contact area for frictional contact with the mouth portion, said contact area having a height from the lowest point of the mouth portion to the highest point of each of said stopping protrusions along the axis that is more than 30% of a height from the lowest point of each of said stopping protrusions to the highest point of each of said stopping protrusions along the axis;
• wherein each of said stopping protrusions extends relative to a width direction transverse to the axis, and further defines an overlapping area with said adjacent one of said stopping protrusion, such that there are a plurality of overlapping areas, each of said overlapping areas having a width along the width direction that is 10% to 60% of a width of each of said stopping protrusions along the width direction.