There is one kitchen item without which my kitchen wouldn't really be mine
type of the Mason Jar.
I have a prodigious number of these. All my friends and family know to keep a sharp eye for these and to give them to me. Mostly I get the ones that are pasta sauce size (24 oz, I think), but about 25% of the time I get larger or smaller ones.
There is a reason why I love these jars and it has to do with one of those kitchen loyalties of mine: My Oster blender.
Y'see, dear Internet, upon the neck of the Mason jar, the base (containing the base, gasket and blade) of the Oster blender fits P-E-R-F-E-C-T-L-Y. So, I often cram things into such a jar, thread on the Oster base, put it on the blender and -- zap!-- I have pesto. Or chimichurri, or soy/sesame marinade or roast vegetable salsa or whatever without getting the blender's jar dirty.
I take the Oster base off, screw on the lid, and store. (Let the record show, your honor, that I have been doing this for decades before magazines aimed at stressed suburbanites who dress out of those museum/public television catalogs came up with the notion.
Beyond this, I like the way the jar looks with other, non-blendered edibles. I just marinated a whole mess of Gaeta olives and stored some triple concentrated chicken stock. In the top shelf of my underwhelming, underachieving, came-with-the-house refrigerator I have over 15 different jars.
I also use them to store/show off bulk spices, give away assorted rubs and spice/herb mixes, store some kinds of dried pasta, etc.
But that Oster blender, that makes everything so.much.better.