no that ICEBOX isn't 4x4. I don't know what it is - maybe 3 x 3.5 - maybe less. Its small enough that a candle can heat it with the windows slid shut. The portable box blinds were made from shipping containers and some light framing and underlayment (luan) plywood to keep it light up top. I have it tucked into some hemlocks -and on real cold days - its as close to a sure thing as we have for taking a deer for the freezer.