I have these, and for the most part, I like them. One of them did get a crack and start leaking, which seems only natural because of the collapsible function. Tupperware replaces broken pieces, but that's a pain.

You know I usually hate to bash something but I ended up with one of these from some leftovers someone gave me and it never got returned. Not sure if this is the same brand but it looks exactly like it. The one I had was extremely difficult to pop up and down and was really shallow, barely held anything. The folds also didn't wash well.

I learned the no microwave part the hard way, managed a few uses before I needed to reheat something in it. Was barely in there 30 seconds and the lid just melted into a goopy mess into the soup I had in there. The plastic felt very heavy like the microwave safe kind so I just assumed it was safe. I guess if I had purchased it I would have known better but no microwave is a big drawback for me.

I have a stackable set from ikea that is just as space saving... stack of lids, stack of containers.

I had these and hated them. Hard to pop out, but they pop back flat when you try to close them. They're just not worth it...

Adding to the negative chorus, and it's pretty much a ditto--a pain to open and especially to close, not really that space-saving, etc.

Friend of mine used these at a potluck and like debtex said, they kept inadvertently collapsing as you're trying to close them. Others forgot they were collapsible, and a couple of containers spilled when you'd accidentally put weight on them.

Wow - this is such a great idea, I'm sorry to hear they are such a poor product.
Thanks for sharing your experiences everyone... I probably would have bought them if I hadn't read your comments.

That said... tupperware still hasn't figured out the microwavable problem? I know that generally you're not supposed to microwave in plastic, but people do it all the time because they're used to doing it with ziploc containers, because they dont have plates at the office, etc. Its amazing tupperware still melts in there.

They seem very clever, but I think buying ultimately unneeded plastic stuff should be avoided, no matter how clever.

I have the Rubbermaid version of these (Collapsibles), and I love them. Mine microwave just fine (the box says they're microwavable, and I reheat in them all the time). They will collapse on you when you're closing them if you don't support the rim with your other hand, but it only took a few times to get the hang of them. Mine are about 2 years old, and I haven't had one tear yet, although I've lost a few to potlucks where people thought they 'looked disposable'.

And this is silly, but because they're flat, I actually store the lids on top of them, so I never have to go hunt down the lid when I go to use them.

I also have the Rubbermaid version of these and I love them. I haven't had any tears, and I use it in the microwave quite often to heat my lunch at work.

We took Rubbermaid versions when we went backpacking all over Asia and South America. They're great for traveling -- don't take up any space, and they're handy for self-prepared meals.

I have the smaller green ones of the above. I use them all the time. I typically use them for vegetables, which is what I bought them for. I do not have trouble with them collapsing but I bought them for the one thing I needed adjustable containers for. They are great if I am just packing a salad for lunch as when I am done I just collapse it down, rinse it out and put the lid back on. The storage is a huge benefit IMO.

The other adjustable thing I have are some that have expandable lids. So when I misjudge the size of container needed no problem the lid will still go on.

I have the Tupperware ones in pink and use them to bring salads to work. They can be a little tougher to close but the storage is key (just like teawithsteph said) - I live in a NYC apartment and need storage space more than anything so they're perfect for me. Actually heard about them from my sister in law who loves the Tupperware ones too.

Indispensable in Culinary School for hiding in my book bag and taking home leftovers at the end of the day :)

I also have the Rubbermaid version, and haven't had problems with light microwaving. I mostly use mine to pack my lunch, a sandwich with some carrots and apples, and I love that it takes up almost no space when I bring it home. I also bring one to restaurants to take leftovers home, since they fit in my purse so easily when flat :)

I haven't had any problems with it collapsing while in my bag, no leaks, nothing. Closing the lid should take no more than 1 min to get the hang of, since the lip of the collapsible part is wider for the purpose of holding it as a support when sealing the lid.

I don't have them because I'm too lazy to clean in the grooves/pleats. Also, wouldn't food just get caught in them, anyway, making it hard to spoon out all the coleslaw or whatever?

Also I'm avoiding plastic.