The bottle seal did not close tightly enough to prevent reverse suction and after drinking from the bottle and putting it down, it would make hissing bubbling noises as it sucked air back into the bottle to reinflate it

This bottle and the older one both make strange noises if you drink from them quickly and then put the bottle down

After you're done, the valve closes and makes an odd noise.

My only complaint is that after taking a sip it will make a weird sucking noise for a while, but that's something you won't even notice while riding a bike

It does make a nasty noise after each sip, again, part of the design of the spout and its a nasty (fingernails on a chalk board) type of sound.

makes an annoying clicking noise when equalizing pressure

I’ve used 3 generations of Podium bottles and this one works just as well as it’s predecessors