1, polygons with the same perimeter have the largest regular polygon area;

2. Circumferences with the same shape have the largest area around them;

3. With the same surface area, the sphere contains the largest volume;

4. It can be combined with practical examples in life, such as balloons with uniform texture, which are spherical when blown.

Therefore, the object in daily life is designed as a cylinder, considering that the cylinder interface is round, including a large area and relatively stable.