Canning jars are my new favorite kitchen item.
They're not just for canning! You can find various sizes of canning jars and lids on sale this time of year - buy them in a variety of sizes, and use them for everything! They're a reasonably inexpensive storage solution, especially when you're trying to avoid plastic storage containers. Even better, the lids are interchangeable, so there's minimal digging for the right lid. Food lasts a little longer when sealed tightly in a jar, too.
I keep dry items like chia seeds, almond meal, and quinoa in larger jars. The other day, I roasted some tomatoes and veggies and made sauce for pasta, and froze
it in a few jars. Pint-sized jars work great for smaller portions of
marinara to serve with calzones or stromboli, or for pizza sauce. I froze some fresh corn in a jar last week. I
have a larger jar filled with fruit salad I made for the week in the
fridge. We even use pint-sized jars as drinking glasses. Lots of possibilities!
I've starting mixing up my marinades, vinaigrettes and sauces in jars - just add all of the ingredients, seal tightly, and shake! This morning, I marinated some beef for beef & pea pods, and then made the sauce up in a jar, gave it a shake, and stuck it in the fridge for tonight.
Be sure to label the jars, and date them, or you'll end up with a couple mysteries down the line. You can write with a dry-erase marker on the lid, or a Sharpie marker.