I love them! In addition to canning, they're the perfect size to carry things like yogurt (from a bulk container) or berries to work. The fact that they all screw together makes storage really easy too - I got mine at the beginning of summer and haven't lost any lids yet (a miracle in my house!)

The price you link to on amazon is $5.99 not $3.99

My wife and I have been using these to carry snacks and other things for our 14mo old daughter. They don't come open in her diaper bag or when she's shaking them, but are still easily opened and she can get her whole hand in them to get the snack. We also use them for homemade sauces and marinades.

I've used these in the 8 and 16 oz sizes. They may start out leak-proof, but they don't stay that way, so be careful. I'd never use them for juice, but do find them nearly perfect for packing a yogurt parfait. Oh, and for using in the freezer, too.

Even though they are BPA-free, they are still plastic, so I use them with caution and never with hot food. Very handy for the lunchbox.

They are also fantastic homemade icecream storage!

I have them. I use them for freezing raw milk in single serving sizes. There is a downside though. There's something about the lid that isn't made consistently. Not all my lids fit all my plastic jars. I have to test before filling. It's a pain. As such, not all my lids stack well.

I tried them a few years back and had problems with the lids cracking in the center. Plus, the food tends to get freezer burn if there is any kind of head room left. I prefer to put my liquids in baggies and lay them flat to freeze.

I was actually just thinking about writing in about this. I have been looking for a good freezer storage option. I buy beans in bulk and make huge batches, then freeze them in plastic zip top bags. Waaaaay wasteful, so this looks like a good alternative. Also perhaps for homemade ice creams?

I have been using these for a while, like others, for yogurt, dressings and things. They hold up fairly well, but I will offer this caveat: they do crack fairly easily after being frozen. (Don't know if that's just us though, because we froze, then unfroze, then froze, etc.) I have had some chipotle puree hanging out in one on the freezer door for almost a year with a little bit of freezer burn (like Liz J pointed out) but no breaking or leaking!

@Pragmatic Epicurean - D'oh! Thanks for pointing that out!

I love these things and have never had a problem with cracking. I use them to store homemade broth, slow roasted tomatoes, leftover canned pumpkin-you name it. Love them..oooh, I said that already.

I've had them and wasn't wowed, they were not leakproof in our case.

I bought some earlier this summer and am liking them so far. I've used them quite a bit for pesto, which I usually freeze in the tiny size gladware containers. I've also used them to carry my toddler's snacks and for my own snacks. I like these better because the lid seems more secure than the gladware. I also like that the plastic is hard unlike the other containers. It is still plastic though, which means it will break if dropped while frozen, melt if you heat it too high, and is of concern for anyone avoiding plastics. I don't plan to rush out and buy more, but as my gladware dies I think I'll buy some more of these plastic jars to fill in.

I use the ones I have for snacks like goldfish crackers, but I've found that for freezer use they crack or break.

I've had to clean out my freezer at least twice because of broken jars. I'd never put a liquid in them and carry them around in my purse--to many spills just in the fridge. Freezer bags work better for me and can store flat or upright. These jars end up wasting a lot of space.

I've used these for a while now, though never in the freezer! I like to use one to protect my ripe stone fruit (plum, nectarine, peach) from being crushed on the way to work.

Love them for all reasons previously stated but they do crack if jumbled around in the freezer. They are perfect for single serve portioning and storing all of the extra cashew cream I make for vegan cooking. Use them for fridge storage all the time.

Did you know you can freeze things in regular glass jars? Just leave head room for expansion. Much more environmentally sound.

I like these for some things, like the leak-proof screw-on lids others have mentioned, but found their dimensions awkward for freezing. I prefer to have containers that are shorter and square for in the freezer.

I have some of these and kind of despise them. They've never been leak-proof for me. Neither are the older-fashioned square freezer boxes, but I had higher hopes with the screw tops. The square ones use space in the freezer better and hold a better amount for me.

they sound like a great idea. both for the freezer for things like soup, but also for the lunchbox.

Bah. I want less plastic in my life not more. We recently ditched most of our plastic storage for glass pyrex and it is working well.

Good point, Pamela K! I use glass canning jars for longer term storage in the freezer (cooked beans, pumpkin puree, pesto covered with olive oil), with very good results. I already had some of these freezer jars, so I continue to use them, but mostly for short-term use, such as freezing chunks of banana for use in smoothies that I plan on making within a day or two.

I used these for freezer jam but I've also used them and their larger counterparts for storing things like homemade broth and when I cook large quantities of dried beans, I can store those in the freezer as well. The larger size holds a little more than what you'd find in a can of beans. It's perfect. I also recommend them for serving single servings of pasta sauce for those nights you are cooking for 1 :)

I use glass canning jars and buy the white plastic lid that goes with them (I bought a house that has boxes and boxes of various size jars). The plastic lids seem to work pretty well and I freeze and refreeze them.

since my family seems to have a problem closing the @#$% freezer drawer, i won't be buying these nifty things.

I find square/rectangular containers much better for the fridge & freezer. Australian company Decor (http://decor.com.au/) produces clear plastic containers in an extensive range of sizes. You can find a size that fits pretty much anything (even pastry sheets; olives - with a removable slotted basket; meat - with a removable drip tray; and cakes - with a removable tray to lift them out). They stack beautifully, they're inexpensive, and readily available from your local supermarket or variety store. I sound like an ad, I know, but I just love them.