Things You'll Need
- Large plastic tub with lid
- Box cutters
- Plastic foam such as Styrofoam
- Straw
Instructions
Cut a 6x6-inch hole into the side of the tub near the corner and roughly 5 inches from the bottom. Make sure you work with the lid side up.
Measure pieces of plastic foam to fit the base, sides and top of the tub. Cut the side pieces about 3 inches shorter than the height of the tub. Place the bottom piece in first, followed by the sides. Mark the area where you've created the hole and cut out the plastic foam to match.
Place a thick layer of straw in the tub for insulation. Do not use bedding or towels, because fabric will mildew in wet weather.
Place the final piece of plastic foam on top. Cover the tub with its lid.