[header] How to keep food cold [title] Choose a cooler made from insulation material suited to your needs. [step] Styrofoam coolers are the cheapest and lightest, although also less effective than other options. Plastic and metal are the next step up, with the former great for camping trips and the latter sturdy enough for fishers and hunters. 
Electric coolers are the most expensive, but eliminate the need for ice. [substeps] Purchase a cooler that works with dry ice for greater flexibility.