Reality: Unless the glass forms a tight seal, this method will fail to block odors, or much else. The real solution to preventing bad odors from entering your home is to maintain the integrity of the P-trap by filling it with water and sealing the drain properly.
Virally-popular ideas such as this often overlook the details of the problem and present a simplified solution that may not work as intended.
If you’re traveling and want to protect your home from potential problems caused by drying out of your P-traps, all you need to do is refill your traps with water and properly seal the drain openings. You won’t need to perform any complicated hacks or glass-balancing acts.
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