I tested them last year — and wrote a full review — and still use them and love them. The secret's in the lid: it's airtight except for a small filter that lets in the precise, best balance of oxygen and carbon dioxide. Plus it's removable bottom lattice tray lets the air circulate all around the fruit and veg while keeping it out of any moisture.
Promising review: "I bought strawberries for my children, and then I forgot about them. I found them in the back of the refrigerator almost TWO WEEKS later, and they were still good. The real miracle is how long it keeps zucchini; again, these miracle containers have kept it fresh for close to two weeks now. I've kept cut lettuce, cut cabbage, cauliflower, broccoli, cucumbers, zucchini, sliced bell peppers, strawberries, blackberries, cut jicama, and carrots in these containers. I've had fantastic results with all of them." —Laura
They come in a variety of sizes on Amazon: get a set of two (one blueberry size and one lettuce size) for $19.99 or a set of three (one strawberry size and two lettuce size) for $31.52.