It's neoprene so it stretches, is flexible and accommodates various small-sized containers. You can't fit a 5-course meal in there but I find that I can fit enough just for my lunches. Again, I wanted something a bit more compact as I didn't want to take too much with me on a daily basis. The zipper is nice thick and the handle sturdy, and the thickness of the material is nice too. It's easy to clean and store when I'm not using it. Does it keep my food cold if I don't put it in the fridge? For a couple of hours maybe but I wouldn't put it in my desk drawer all day if something needs to stay cold. It's not an cooler, just something to keep your food moderately comfortable for a short period of time.