Systane preservative-free single use vials

[Flick]

I just realized today that these little guys can be re-sealed! It's nice, so you can use them throughout the day without worrying about contaminating the top. I'm probably the last person to notice this but oh well . . .

[adamlau]

I am actually the last person to notice...Thanks for the tip!
I usually place unused vials in a plastic bag and refrigerate them for up to 6 hours if need be.