A person cam build a large cooler very easy. Go to your local building supply store. Buy a few sheets of rigid foam board. 2" works well. Also buy a roll of Tyvek tape. Use hand saw to cut panels. I built mine on a pallet then used a cardboard refrigerator box to make the exterior more durable. The floor, top, sides are 2 layers of foam board. On my last antelope trip I filled two 100qt ice chests with 1 gallon/1 qt jugs of ice. At the end of the 12 day 100 degree hunt. The ice was still frozen. Shade and canvas painters tarps were used to cover/fill gaps in the box. The problem then becomes having room to haul it around on hunts. I have a 7'x16' car hauler trailer I use. Getting meat cold and keeping it cold is just a matter of being prepared.
