Mediocre.

I expected this cup to be airtight. But when it is tilted, the contents of the cup leak out of the hole near the tube and from the tube itself.
The lid itself fits quite tightly, but I would not dare to put this cup with liquid in a backpack with equipment, etc., because the lid can actually fly off if it catches on something.

Delivery and checkout were fast, no questions to the store. But the product itself did not meet expectations at all :(