They are waterproof unless you don't seal the lid correctly HOWEVER do not fill the containers to the max (180ml) with milk otherwise when the day separates it will collect on the lid and because you have to mix three milk with the fat again to make a bottle, it will cause spillage when you unscrew the lid... also it's very hard to see the volume when the container is full

I exclusively pump using a breast pump and initially used the disposable bags. As soon as I bought these cups, my hands were freed. They are very convenient to use. They clean easily, fit comfortably in the sterilizer, and protect the environment from the plastic of the bags. They hold a lot of milk. You can stack one on top of the other and they wedge together so they don't fall. They screw on easily, although you need to be careful not to screw them on crooked. The best part is that you can attach the adapter (included in the box) and a nipple from a Philips Avent bottle on top, and they become bottles! Ideally, I would like the ml measurements on the side to be raised so they are easier to see, but that's a minor issue.

At first, we used them for storing breast milk and later for storing solid foods. From the constant putting in and taking out from the freezer, only one of them broke once, and that was our own fault because we handled it roughly. Their lids do not leak

We got them at the beginning of solids and they have been very helpful. I use them to store leftovers for lunch as I can easily warm it up later in the corresponding Avent heater. I also use them to store cooked meat in the freezer.

They have been very helpful to us! As we breastfeed and haven't been able to go to work, we haven't needed to stock up in the freezer. In fact, I always have 5 jars in the freezer in case my husband needs to feed the baby. They latch on well! They don't leak, I have transferred freshly pumped milk inside them and put them in the diaper bag in the bottle compartment, and not a drop spilled (of course, I had them upright, I didn't turn them upside down). They have ml measurements on them, so you can see how much you've pumped! You can write the ml and the date on them with a pencil and easily erase it with an eraser! They can be sterilized and they don't get distorted! They fit inside each other, so you save space! They also attach to Philips breast pumps, so you can pump and store immediately! And they can be put in the dishwasher too!

Very convenient containers! One snaps on top of the other for extra practicality in storage! Easy to wash and the lid seals well so they don't leak.
Removing one star because the ml level is semi-transparent and difficult to distinguish when there is milk inside.

Very convenient for storage but they softened a lot in the sterilizer. We found a glass bottle stuck inside a container that softened from the heat and deformed.

For ground foods and creams, they were very convenient for us without any leakage in the refrigerator and freezer! Also, I can heat the jar directly in the heater or bain-marie

They have been very convenient for me, but the truth is that they do not make good contact, so I put them in the freezer carefully until they freeze to avoid any leakage.

A star for breast milk storage (as advertised), because they don't fit well and they leak, whether with the regular lids or with the ones for bottles. They don't screw on easily and require 2-3 attempts to get it right, which shouldn't even be a topic of discussion... they look like urine collectors, they should have copied their expertise in sealing as well, it's not a state secret! I thought mine were defective but I see that other reviews also mention the lack of waterproofing, so they are not suitable for use with liquids.

As small containers for food storage, snacks, etc., they are very practical, but there are countless cheaper options. Of course, as branded products, there is a trust in the quality of the plastic: the same company produces a similar product with a different code, perhaps that one is not problematic.

Practical for storage. Pay attention to the closing, there is a risk of leakage because the lids do not fit perfectly on the containers

Much more economical solution than disposable bags, as they can be washed, sterilized, and used multiple times!

There is no how much they have helped me! Incredibly practical for storing and thawing breast milk, but also for storing the child's food in the freezer and then thawing it and ready to go! Reusable, I have had them for 2 years and they haven't suffered anything! I highly recommend it!

Very convenient for collecting breast milk, especially when used in combination with a breast pump from the same company that fits and attaches directly onto the container.

Very practical! We still use them for her mashed food. They fit in the dr brown's bottle warmer and are perfect for outings!

Very good waterproofing. It fits very well with the Philips breast pump for immediate milk collection and storage.