My roommate owns one...Nd about every second stoner I've met. They are cheap, which when it comes to marijuana paraphernalia, cheap = not good. You got to spring the extra few bucks if you want something that will work & will last.
The seal around is not air tight, I can pull it apart with my bare hands. It could use a rubber o-ring. That'd probably solve that problem. The seal also has a tendency to get covered with THC crystals, as plastic usually does, which further more messes up the seal.
I'm sorry, but I just don't like this product.
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TightVac Vacuum Container
Keep your stash fresh and smell free.