I take my deer meat which is wrapped in white paper, and then vacuum seal it. Takes a long time to thaw at room temperature. I say do that plus maybe wrap it in old newspaper about an inch or two thick. Bubble wrap might also work. Maybe some styrofoam cut out for the steak, then tape up the outside of the styrofoam. They do make styrofoam coolers. Can get styrofoam at arts and crafts stores or Walmart. Styrofoam is lightweight. I have taken steaks hunting, but kept them frozen in a cooler. Took a few days to thaw out, but was good eating fried in a pan over the fire.