Some fluid as a result of bumps or filling, which is generally expected, is not the same as a lot of fluid, because the moment you turn the bottle upside down with the valve open, the liquid starts flowing freely. Which is a result of flawed design and a lack of a self-sealing valve.
Your issue is not the opposite, it is unfortunately just an additional issue, which proves that this bottle was designed as an afterthought.
Your issue is not the opposite, it is unfortunately just an additional issue, which proves that this bottle was designed as an afterthought.