Many students use buttons ~ ~ I have seen cups marked with buttons ~ ~ It should be quite good ~ ~

The buckle is tight ~ ~ hot water will not leak ~ ~

The white cup in Wuxi doesn't leak ~ ~ I use that ~ ~ anti-scalding one ~ ~ but the capacity is relatively small ~ ~ It's more convenient to lock the cup to make tea ~ ~ ~

It's best to change the buckle ~ ~ but it's best to buy genuine ones ~ ~ Don't buy ones that look the same but have different brands ~ ~ The imitation quality is not very good ~ ~ Plastic parts are easy to spend ~ ~ and will break when falling ~ ~