We bought this item for camping trips without hook up. The reviews were good but not specific for what we needed to know, so hopefully this will help others in our situation. We packed the box with milk, yoghurts, chicken, margarine etc. and around 6 ice packs at around 9am Tuesday for a trip to the New Forest. It was used regularly, lid on/off for cups of tea, lunch etc. The ice packs were melted by late Wednesday, but when the wife took a can of coke out Thursday evening it was as cold as if it had been in the fridge. Milk, marg etc. still perfectly cold and no reason to believe there was to be an imminent change in temperature. The weather outside was sunny although not as hot as earlier in the summer, but the inside of the tent was warm. Has sorted out the problems associated with camping without hook up-yes it's expensive but you get what you pay for. The box is big but it is useful as a table especially with the cup holders! All in all, a great product that solves the chill problem.