I just received it and measured it internally:
38.5*24.5*29= 27.35 liters.
The external dimensions are: 44*31*29.5

Unfortunately, it doesn't even keep with ice cubes. I filled it with 3 kilograms of ice cubes and besides the fact that even the water bottle that didn't touch the ice was warm, the ice cubes melted within a few hours from the warm temperature inside the refrigerator. Not even the ice packs managed to cool it down a bit, completely unsuitable for meat, cheese, deli meats, and fish. It only works for refreshing drinks, etc., and only for about 6 hours

I used it to transport and keep sweets at the right temperature for a baptism on a very hot day. For 4 hours, the sweets were just as we put them. It did its job perfectly fine.
I can't say that it is very durable in case of misuse. I should mention that it doesn't have any internal or external lining, it is as you see it in the photo.
It is a pretty good product but it won't last forever. For transporting frozen or fresh products, I consider it to be a very good and economical solution.
I hope I helped