The threading on the bottle is bad, these are pretty cheap overall.

The threading is either not enough or the top is too small for the cap

The threads of the lid are cheap and do not stay on well

As other purchasers have indicated, the threads on the bottle and cap are way too shallow and aren't long enough to hold.

Used mine 3 times before the soft plastic threads on the lid stopped working making it impossible to use without lid.

Poor threading they are basically worthless.

I had high hopes too but the plastic is so cheap and thin that there is no good seal between cap and bottle, maybe there aren't enough threads

The issue being the threading on the plastic caps is very loose, one thicker ring and a very loose fitting

Squeezing the bottle causes the threading to squeeze a little as well.

They dont close tightly because of the cheap threads on the cap

The threading on these is terrible.

Work as they should.