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I don't get the problem as you can easily drink with the AVP. While wearing the AVP, I've drunk from a wide mug (4" opening, but with the lid), and it works well: https://www.hydroflask.com/24-oz-mug?color=Agave (note: this is a larger 24oz mug)

No drinking problems here. I've only drank hot and cold liquids, though. I'm not crazy enough to attempt drinking chunky soup while wearing the AVP.
 
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