I was looking everywhere for a cooler that would hold one bottle and this is the ideal product! I’m breast-feeding but when we go to the store or go out and I only need to bring one bottle with me this fits perfectly in our diaper bag and fits all the bottles we have including the 8 ounce Coco tomo! Bonus is it comes in a 2 pack!I got these for a road trip because I breast feed and needed to pump and have breast mill ready to go with no way if heating it up. It was a 15 hour road trip and I pumped every two hours. I used one with those hand warmers you can get at walmart for like a dollar two packs kept milk warm like really really warm almost hot dont use three or it's too hot. Then the other I froze water in a beest milk bag so it fit better and it kept milk cold. If i used 4 hand warmers it would heat up the cold milk too. I'm so happy i did this made traveling so much easier.Seem very well made, like itI actually really like these i love the fact that its for a single bottle I bought it along with a small ice pack as per previous comments the one i bought i have added to the end of my comment! Works very well together I exclusively pump and through out the night i dont have energy to go up and down my stairs to put and take out a bottle from the fridge i keep the tommee tippee bottle cooler with an ice pack in there zipped shut and when I finish pumping i place my bottle in there... my milk comes out warm and leaving it in the cooler with the ice pack it actually cools it up and it doesnt go bad and its ready for the next feeding for my son. They are a bit too bulky to fit in a diaper bag but I usually just velcro it to the strap of my bag and let it hang there once im using the stroller i can put it on the bottom carrier and no problem there... can deff be an issue that can be resolved and no need to shame the product because of it just think the tommee tippee bottles are bulky themselves so of course the holder that is made to hold it will be bulky as well! Comes in a 2 pack so i would suggest buying 2 of the ice packs attached that fit perfectly with the cooler and they work well also. (Innobaby Aquaheat Cold Pack - Round https://www.amazon.com/dp/B00H9O5MMG/ref=cm_sw_r_cp_api_i_s3bfEbTRNAWH0)Not sure if these are meant to keep cold only with ice pack, but they don’t work well with keeping bottle warm for long. I owned different brands that would keep hot water to use for formula for 4-5 hrs, these only kept 45-60 mins (if that) and that is with towel wrapped around the bottle for extra layer to keep it warm longer. In these, the water would become barely warm. Also, it’s not sturdy, kept flipping over. I gave up, tossed away and purchased another brand.was hesitating between giving 3 and 4 stars. the bags look pretty well, they are very spacious in width, but not so much in height. The standard 8oz Dr Brown bottles don't fit in if you put them with their lid on. they would fit in if you leave the lid off and put the nipple bottom up. 4oz bottles fit in perfectly though. I think I will keep the bags and buy a few 4 oz bottles." didn't use them yet, so can't tell how well and for how long it keep the bottles warm/cold.updateok, so I got to use it once: it held the milk warm for about 2 hours: however, I was mostly indoors (in a mall/store) for the entire time (except for 5 mins) and the milk was indeed still warm, but not as warm as it was when I left the house. So, now, i'm not sure whether to keep the bags or not...Love this product! Bought these as a replacement for one I got on my baby registry. Keeps bottles, sippy cups, and drinks cold or hot! I use this heck out of this thing and my daughter is two and a half now and I'm just now replacing it. To me, that's a lot of use for the money! The main reason for replacing is that over time it will get a stale milk smell, no matter how much you wash it (wish I think is expected) It cleans great in the washing machine or the dishwasher! Functionally it still works great and the smell doesn't affect the drinks inside, I just wanted to replace it. I will use this all through her school years. I love that the handles are velcro because you can attach it to a diaper bag, lunch box, stroller, etc. I would definitely recommend this product!As a tip.. if you are using it to keep drinks cold, I keep it in the freezer before I use it and it seems to keep the milk cold much longer.It keeps my baby bottle warm for 5 hours ?Great for transporting bottles but doesn't actually keep bottles warm for very long unless the bottle is extremely hot. If bottle is made at a drinkable temperature it will only remain that warm for approximately 30 minutes before it starts to cool down.Muy prácticas, cumplen su función de mantener calientito el biberón del bebé, lo que no me gusto fue el diseño en negro, deberían tener variedad de coloresWe use these insulated bags for small thermos food containers so the kids can have things like soup for lunch. They work great and help keep the thermos insulated. Sometimes I’ll even put a foil wrapped pizza pop inside. Makes lunches a little easier. Exactly what I needed.Handy and keeps contents fresh for 6-8 hours without ice packs in it. With ice packs in it wil go upto 12-24hours, depending on the ice packs used, however, tried only cold packs, while on journey a must have for storage. Hot never tried.Son muy practicos para llevarlos a donde sea. Con el asa que tienen los cuelgas donde quieras. Si conservan calientes los biberones, pero para lo que yo los queria, no me fueron utiles ya que por mas de 3 hrs de almacenamiento, para algun viaje ya estaba mas tibio de lo que mi bebe lo tomaba. Mejor opte por llevarme un termo con agua caliente y prepararlo al momento