After reading reviews which left me with unclear / mixed answers prior to my purchasing these containers, I decided to buy them and see for myself what's up. Now that I've viewed and used them, I'll do my best to give the clear answers to clear up any confusion that other potential buyers might also have.Please see my review's photos for reference material. I marked each photo with a letter so you can 'see' what I'm talking about.- QUESTION: Some reviews say the containers leak, others say they don't. Which is the correct answer?- ANSWER: Yes and no. The compartments themselves are solid, but there is a small gap between the compartments' edges and the container lid. If you look at Photo A, you will see that I am pointing at the edges which are too low to meet the lid. Because there is a small gap, if the container is turned on its side, upside-down, or shaken around, liquids will ooze or spill between that low spot into the other compartments. That is the 'leak' people have spoken of. However, with the lid sealed in place there will not be any spilling / leaking OUTSIDE of the container; it will all be kept inside.- QUESTION: Is there a way to prevent leaks?- MY ANSWER: Yes. I used safe, food-grade silicone sealant (purchased separately and cheaply) to draw a little line of the sealant along the edges which are pointed out in Photo A. After the sealant dried, it worked as a complete barrier between the edge and the lid -- so there was no sloshing between the gap.- QUESTION: Do the compartments themselves leak into each other?- MY ANSWER: No. Aside from that small gap mentioned in Question #1 and pointed out in Photo A, there are no gaps between the compartments. Their walls are solid. In Photo B, you can see that I placed 3 different-colored liquids in each compartment, each at different levels so that you can clearly see they're blocked. There is no mixing or leaching of liquids between the compartment walls themselves.- QUESTION: Do the lids have trouble fitting on the containers?- MY ANSWER: Yes and no. First you'll need to make sure the seal is pressed all the way into its groove, just like -any- sealing lid. Then there's a specific trick for getting the lids on properly: the flaps need to be lifted outward, almost even to the rest of the lid. You can see this in Photo C. After the flaps are straight, set the lid on the container and then press the opposite flaps upward at the same time until they snap into place. If the flaps aren't even to the lid when you try to push them downward, you'll have a hard time and struggle to clasp it on; they won't go, or the lid will start sliding ajar. Once the lid is secured, however, it is on firmly and will not slip or allow leaks past.- QUESTION: Do the lids' seals fall out?- MY ANSWER: Except for issues where the seal is legitimately broken (cracked / snapped in half), the seal is supposed to be removable. You can see this in Photo D. This removal enables you to clean out the lid's groove, and to clean / sanitize the seal (else if food gets beneath and it's never washed, bacteria and / or mold will grow; this is fact for any product with a seal like this). Once the seal is dry, you can press it back into the groove with your fingertips. Make sure it's firmly and all the way in the groove, else it'll cause you some difficulty with snapping the lid on -- which, again, is true for every product with a lid like this.