I use these jars to store single samples from each of my grows, they work great, not particularly airtight, but I don't need them to be. No problems, the lids screw on tight, and they look fantastic.One minor issue, I keep them in a box, and once I dropped the box, the glass is so thin that a few of the jars shattered from a 3 foot drop, clanging against each other. so in short, just don't drop them and you should be good.I still like them well enough that I bought another two packs for uniformity.
Rating: [5 of 5 Stars!]