I keep a lot of them, but so far have only used them for tranfering juice and to give away juice. I keep a lot more than I need for that just because, well, who knows what I may need a 3, 5, 10, 12 15, 18, 30ml bottle for lol. It's especially hard to toss those nice amber and deep blue glass bottles. I'm not a hoarder with anything, I'm actually big on tossing stuff I have no immediate use for, but with empty juice bottles I have become a hoarder.
I like it when vendors use different colored caps instead of the common white ones. I use purple on my fruit flavors, orange on menthol/mints, black on tobaccos, and white on everything else. These days the black caps are getting the most use.
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