I don’t mean to sound rude, but you need to try one. I don’t think you understand how they work.
Do you have a picture of the downside of the camelback bottle cap/lid? Just trying to see how it works and how much plastic goes into the liquid (for hot liquids). I can‘t find one online.
WRT Camelbak bottles, I find the non-insulated versions to work well as far as being easily squeezable. The nozzle/valve also works well for me. I find the insulated variety to be much too stiff and don’t use them.
No I get it. If there is no vacuum in the bottle, the contents can free flow if the angle permits it. Someone on a ride had a bottle that free flowed on them. Never knew what brand it was, but they had to put it close to their mouth to tip it to keep it from getting them a little wet.
Yep. It has a long silicone siphon that delivers air to the bottom of the bottle, top when inverted. The siphon opening in the lid has a hidden one-way valve. The top nozzle actually fully opens so the siphon valve actually controls delivery, as there is some resistance when I suck on the end (can’t blow out through it). The whole ‘plastic’ part is the actual lid. It’s beefy hard plastic with a gasket. Really well designed IMO. Can’t wait to use it. (The silicon part is removable also for cleaning)
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I got the 550ml boyo version, it’s a great bottle and thermostatic too.
Makes a heck of a noise when you drop it though…
But you can now have a company suck all that microplastic crap out of your body! What a deal!?
Sorry I sort of wasn’t paying attention to this.
These bottles do free flow. You can pour them on yourself. This is not something I have struggled with because I tend to put bottles in my mouth then invert them. I’ve never inverted a bottle just casually over my face except to cool down. Luckily, I’ve never done this with drink mix.
The upside is that you can get a lot more fluid out rapidly. I like chugging my drink mix rather than just taking small sips.
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Yesterday I happened to be in shop that had a big display of stainless steel Camelbak cycling bottles. I checked out a couple of them and they did have a silicone air vent tube that extended about 7-8" into the bottle. This would def speed flow when drinking, but also allow liquid to run out when the bottle was inverted. The pic posted earlier by Neuromancer shows a design where the vent tube bends back close to the lid. This would help prevent or at least greatly reduce the tendency of liquid to run out when the bottle was inverted.
Specialized Purist bottles have a coating of SiO2 (sand) coating the inside of them? It is said to make cleaning easier. Would this not also act as a barrier to microplastic transfer to the liquid?
It’s not likely to free-flow like some designs. I posted the Poduim pic and an explanation of the tube. It does have resistance, it’s not full on at all. I wouldn’t think that it would free-flow unless shaken. There might be some natural leakage just from the air entering around the nozzle/nipple, but it’s not likely to gush contents out.
Not to worry.
The new EPA head is meeting with the American Petroleum Institute to establish a RDA for microplastics
It turns out they are actually good for you.
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“You know what is the second-best word in the English language? … Microplastics. I love that word. Immensely powerful.”
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At this point after all these years, I’m sure I’m fully riddled with microplastics. A few more particles on top of that will likely be inconsequential. If I was younger, I’d be more interested in trying to reduce my exposure.
I like using my Contigo steel bottles. You push a button thay opens the spout and an air vent at the same time, so you can chug out of them. Let go and it seals.. hard to spill. Plus they are insulated. But I was told stainless steel bottles on my road bike are a major faux pas. 
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Have a few Keego (https://keego.at/) and can definitely recommend. Use them for everything but races where I need bigger bottles.
They’re titanium inside and squeezable - they also don’t start smelling or whatever, easily cleaned with just water.