I looooooove these... I have a few in different colours and sizes! They make certain things a lot easier, like when you buy in bulk and need a handy, easy to use container to dispense from. I've recently started putting my cleansing grains in a smaller jar with a recap - super easy to pour out that teaspoon of powder into your palm, and then seal back up against moisture! I keep my jar in the shower and haven't had any problems! The next thing I'll try is using them for fermentation - you can stick a fermenting airlock thingy right in the recap hole, perfect fit! No need to worry about jar lids popping, or cutting a hole in a regular lid to accommodate!
The design is just excellent, and they're sturdy. I like them. I like them so much. :)