It makes noisy sound and leaves air in your sip.

It makes a weird sound when you use it and it gets a lot of air into your mouth

There is a hole in the straw on the side (about the 11AM mark on the bottle) so when you drink air comes in, it makes an annoying sound and now you have half air and half water as your drink

The straw made a hissing sound when trying to drink so not a lot of water would come up when you suck

The flip lid does not stay up and smacks u in the nose, the straw is completely awkward and in order to drink out of this you have to very awkwardly hold the handle, hold up the flip lid and turn it to the side a bit