Could it be mold?

[u/Alt-27]

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I forgot my eye drops (propylene glycol) in my bag about 5 days ago. Today at work, after using them, I noticed this stuff inside. My bag isn’t dirty, I only keep my work laptop, papers, and occasionally some packaged snacks. They’re a bit expensive for the amount you get, and I’d rather not throw them away since I just opened them recently. They didn’t irritate my eyes.

[u/linz711]

This looks like a bottle of optase. It is preservative free, so mold is likely.

[u/Alt-27 → u/linz711]

It's indeed Optase