CERES CHILL Reusable Breastmilk Storage Container & Chiller - 20-Hour Cooling for Safe Breastmilk Storage - Compatible with Major Breast Pumps (1 Chiller, Bright White) - Perfect for Travel, Work & On-the-Go Moms

Love it! Why? Listing pros and cons below and will list some tips at the end. Hope it helps. In short, I do think that any good Thermos could do a great job as well if you have access to a fridge at work and that is where you intend to use the chiller. If you need to chill milk without a fridge, read on.Pros:- It eliminates ice packs to chill pumped milk in absence of a fridge (great for the forgetful, tired mom ;)) and you don't have to travel with a bunch of bottles. I feel it is way easier to handle. I used it this way mostly when traveling, not so much at work (where I had access to a fridge).- Stores milk COLD. (Keep in mind the inner chamber only holds 12 oz! 24 oz if using inner chamber for ice and storing milk in the outer chamber. Still nice and cold, but less so than with the milk in the inner chamber.)- Can be re-used as a Thermos when done pumping!Cons (not really, just inconveniences for me):- Inner chamber only holds 12 oz. Not enough for a work day's worth pumping for most moms. Even when using the inner chamber for an ice/water mix and filling the outer chamber with milk, that is only 24 oz (possibly 25, but that's cutting it really close when screwing in the top). If you have access to a fridge, you can store about 34 oz in the bottle and it says cold enough on the way home even without ice.- Price is a bit steep for what it is, especially if you aren't using the ice chamber as intended. But it is versatile and I did make use of all options over time.- The direct pumping option doesn't work well for me (didn't seal well) and isn't really practical due to bottle size and the need for two chillers if you want to double-pump!Tips:- Let your milk come to room temperature after pumping and before pouring into the chiller (if you can). It definitely helps keeping the ice longer.- The inner container is small (12 oz). So, likely too small for a whole day's worth of milk. I often used the inner chamber (filled it with ice chips and added cold water from the fridge) to chill. 24 oz of milk can be stored that way. That still was not enough for me most days (I have twins and easily pumped 40 oz during a work day). I have also used the chiller without ice since I do have access to a fridge at work (about 34 oz can be stored this way). I just pumped into some regular bottles and "dumped off" into the chiller. The milk stays cold enough on the way home if it was kept in the fridge during the day. I left a pump and a whole set of pumping parts at work, stored in the fridge between pumps and cleaned at the end of the day - dried over night at work. (Works well if you have access to a desk or a locker, a sink, and a fridge).- You will get some milk fat stuck to the inner chamber if you filled that with ice. Also might have a milk fat "ring" if you just stored milk in the bottle in the fridge. That is perfectly normal and happens to any breast milk storage container. Just leave a little bit of room in the bottle, make sure the ice chamber and the top is sealed well, tip over and swirl/gently shake for a bit to re-suspend the milk fat before pouring out.- I used several 32 oz Mason Jars with pour lids to store milk at home (poured into those directly from the Ceres chiller when I got home from work). This allowed for easy pouring of bottles for our nanny while I was at work and doesn't create a bunch of plastic waste from bags. If you prepare bottles for day care the night before, you won't need extra storage - just pour directly into the bottles that go to day care!- Obviously, if you want to freeze milk on a routine basis, you still need a system for that. Consider "milk sticks" or "cube trays" and large freezer bags for that. That will cut down on the plastic waste as well.Good luck, pumping momma! You are doing a fantastic job for your baby! It is HARD work and a LOT of commitment. Make sure your family appreciates and actively supports your hard work and dedication! Pump on, momma! You've got this!