Another use for jars: Craft items for kids.
Here's what I like about this. It's plastic, so it won't break. And it's not a bag. My girls have a craft bin that has loads and loads of baggies in it. It works ok. However, when the toddler joins my big girls, the bags get torn open. But, toddlers can't open jars as easily. Hence I get to stay one step ahead of my toddler.
And it's reusing an item that would otherwise get tossed (in the recycling bin, but still...repurpose is better than recycle). I may be switching to jars in the near future.