Why do some sippy cups have a small ball at the bottom and others don't?

There are many kinds of water cups, including stainless steel, plastic, glass and so on. There are also many types of water cups with flip-top lids, screw-on lids, and sliding lids with straws. Some friends noticed that some water cups with straws have a small ball under the straw, while others do not. What is the reason?

Straw cups are used to facilitate drinking. It was only used on plastic water cups in the early days, and now it has been extended to water cups of various materials. I don’t know if you have noticed that children’s water bottles are more likely to have balls at the bottom of the water bottles, while there are no small balls at the bottom of adult water bottles.

The small ball is a reverse device, and the internal structure is combined with gravity and pressure, so that when the user is not drinking, there will be no omission due to the upside-down angle and other angles. Therefore, most straw cups with reversers are used by children. Because children are physically fit, hyperactive, and have not developed the habit of placing objects, etc., it is easy for the water cup to fall over when using the water cup.

What's more serious is that the child is lying with a straw. If there is no reverse device, it is easy to cause the child to be choked by the backflow of the water cup. Before the reverser was invented, children did use sippy cups many times, and some caused more serious consequences. It can be said that the reverser is developed for the imperfection of the habit structure.

The straw cup without the reverser is more suitable for adults, convenient and easy to drink and easy to clean. However, since straws are mostly silicone products, new straws should be replaced regularly.

Reminder, when using a straw cup, do not drink hot water, dairy drinks and drinks with high sugar content. Drinking hot water from a straw cup can easily cause burns, and milk and beverages with high sugar content are not easy to clean after use.

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