It keeps everything very cold for at least 6 hours! I don't know about 12 hours, but it was tested from 11:00 to 17:00 in high heat at the beach, while it was hit by the sun, and it works perfectly. I consider it spacious.

It keeps food and drinks cold for over 12 hours (with a 900ml ice pack).
It is not ideal for containers because it is curved on the inside.
At the beach with 45 degrees, in the shade of the umbrella, and everything inside was cold.
It is very stylish and the strap adjusts easily and is comfortable on the shoulder.
It is worth it but the price is excessive.

Very nice cooler, permanently with me now at the beach.
It comfortably fits snacks, beers, sandwiches, and water for 3-5 people.