This is a well thought out bag. Simple and perfect for just the pump and milk. If you need more storage for that, like for a laptop or other things, this is not your bag. But it worked great and I am happy. I provided more details:Bought this for a recent trip. Didn’t know breast pumps could be considered medical devices and be separate from your carry on allowance so was looking for a stand alone bag.Carried my spectra S1 and accessories easily in the main compartment. I love that you can separate out the insulated bag. So many are attached to the bag and was afraid that TSA wanted me to fit the milk in my carry on.The separation did give it extra insulation I feel. Also it comes with an anti microbial mat for putting your bottles/pump gear when using out in the wild. I put that in the insulated compartment for extra support as well.Bought the grooved ice packs so that the bottles were fully covered and could fit 3 of those packs and store up to 6 bottles. Ice pack was still frozen after 4 hour flight (and several hours in the airport)It also comes with a lot of flat ice packs, which is pretty wonderful if you didn’t have packs. And elastic straps to keep the milk/ice packs together.Back straps are thin and not super comfortable. It has a snap on the top handle so I mostly attached it to the stroller, which was a great added bonus. And I preferred holding it by the handle overall.Lastly, it has a lot of little compartments in and outside the bag, which is nice for organization.