Do you use them? Any tips or suggestions for their use?
Here's mine...
I like the Gladware and Ziploc brands. I tried the Rubbermaid "take alongs" but thought they had a chemical or petroleum odor that came off in my food, no matter how many times I washed them. I ended up using them to store screws and doo-dads. I tried the cheap knock-offs at Walmart, but they were not flexible enough and difficult to close. Other store brands, such as Food City, are good and can be a great bargain.
Ziploc makes small 1 cup round containers that I find perfect for making portion controlled frozen dinners, such as veggie chili or soup. They also are good for storing cut onions in the fridge.
I buy most of my spices in bulk, fresh ground for best flavor, and get them in bags to save money. I used to invest in spice jars, but now use the small containers (above) to store them. I can easily see how much is in them, and they stack nicely in my cabinet, saving space. They are especially useful for whole spices such as nutmeg or bay leaves, that need something better than a regular spice jar.
I like the large ones for mixing a dinner salad for one. It's less messy than tossing on a plate or even a regular bowl. I can add my dressing, cover with lid, and shake to coat. I even eat out of it