Several years ago, I found myself cleaning out a cabinet stuffed with various bits of plasticware. None of it matched, none of it lasted more than a few months before it either fell apart, lost a lid, or got warped in the dishwasher. I had the cheapie kind and the more expensive kind and it was all equally terrible. I felt like I was CONSTANTLY buying this stuff and I hated ALL OF IT.
So, I threw it all away and started over again.
I visited Tupperware.com and ordered an entire set of lifetime-guaranteed items. I only purchased what I thought would fit our lifestyle and needs and, well, it was expensive. I can't remember how much, but I remember thinking I was insane for spending so much money on TUPPERWARE.
Seven years later? IT WAS TOTALLY WORTH IT. I have some very basic sized items, ideal for leftovers and while they are essential, they are very boring and round and are basically just higher-quality versions of what they sell at the grocery store.
It turns out my favorite buy was a set I only ordered because I remembered my mom having them, so I figured they MUST be useful. (My mother doesn't tend to keep an un-useful thing for 30+years.)
These are very handy little guys. They have 1 ounce, 1.5 ounce, and 2-ounce markings on the side, which makes them great for portioning out salad dressing or other condiments for a lunch. They are wee, but very spill-proof in my experience. The lids are stout.
They're perfect for baby food in the early days (an ice cube of pureed food fits perfectly). I also portion things out I want to mix together later (salsa on a burrito, croutons for a salad). You could use them for raisins, almonds, or any other tiny, snacky things you don't want to waste a plastic bag on.
I've also used them for traveling and scooped a dollop of moisturizer in one, a few pumps of face wash in another, shampoo, conditioner, etc. (Not TSA compliant, of course, but it will save you lots of space on a road trip or in a checked bag.) I do put them in a plastic bag when I travel, but they've never leaked.
We use these several times a week and even though they're very small, we haven't lost any of them. Excellent buy.
(Photo from: Tupperware)