I don't know why I was expecting the jars to be small, I know the size of springs. But there are some pretty large plastic jars. 3 1/2" by 2". Sadly the metal lids on mine were pretty scratched up, they also have huge barcode stickers on the top that once removed leave a lot of glue. It kind of defeats the purpose of having nice packaging.
The spring length and weight are listed on the bottom where the barcode should be. They all also have a safety seal which I thought was funny, since it wasn't even sealed on and their springs. Once Removed from the nice roll of plastic you won't be able to store them back inside so it's just a big waste of plastic. I like the jar as you can reuse that. But the plastic that holds the springs feels very wasteful.
As for the actual product, I have not put them in a full set of switches yet, but using them in a few there are pretty good springs. I would like to buy them again for the quality of the spring and amount of options available. But the packaging is very much a gimmick and is wasteful at the end of the day and only takes up more room on my keyboard parts shelf.
I'd love to see them shipped in smaller jars with no plastic roll.