(This review was collected as part of a promotion.) I have tried so many food storage containers in my lifetime it isn't even funny. I found I liked the clip lid kind (used a different brand) but I did not like that the were not really clear. I decided to give these a try. I really really like these. They are clear and the snap lids are perfect. You can just lift up the clips and leave the lid on to cook in the microwave. Under the clips there are air holes and this is why you can cook with the lid on. This stops splattering in the microwave so I don't have to change containers or put a paper towel over it etc. In fact when we re heated some chicken wings they were re steamed so to speak and came out moist, nicely heated. We tried the spaghetti sauce storage and found no staining. I was hoping to nesting since some folks had said they did nest. Well, not really. You have to nest the containers and keep the lid separately which is not really nesting. BUT, they set nicely on top of the bigger piece (with their lids on) and makes a neat stack and I can just get the size I need so I am ok with that. They clean up easily (have not tried in the dishwasher yet though) and make my food easily viewable in the fridge. I am going to get some additional sizes. Very pleased all around. Not unhappy about the nesting as I thought I would be. With the nesting you have to take all out to get to the smaller middle one etc. which I was doing with the previous kinds and when I got these I realized I was frustrate with having to un nest all the time. Because they stack nicely, they wash great, so far no stains I am really pleased. When you go to take the lid off it is a bit "tight' but there is a lip on their that allows you to pull and release the suction. Not hard at all but really just reassures me there is a good seal to keep the food fresher.
So far I still really like these products. Wish they came in a few additional sizes though. I like the easy open (yep you unlock the side clips and push down slightly on the lip to separate. You will hear a "woosh" which means these things seal really really well. The other clip lock types from other brands we have used did not have that. Love the fact we can lift up the clips and put food into the microwave still in the container with the lid on (gotta lift up the clips though so the air holes are exposed). I would say it almost steams the food because of the lids still on and makes stored food moist and fresher. They still wash well, don't stay so far. And as I said they do not "nest" BUT I really don't miss having to undo 4 or 5 containers to get to the little one in the center. Nesting is great for saving space but got really annoying so I would just put them in helter skelter because I did not always want to make time to "re nest" them. So these stack block like on top of each other depending on the sizes and I am fine with that. Really nice food storage containers, just want a few more sizes.