Reinforcing a coca cola can? Help please!!?

Question

What the most efficient way of reinforcing a coca cola can(non destructive) given these constraints.....
Constraints
1. The height of the can must remain the same (i.e no additions can be made to the top and bottom of the can)
2. No more than 70% of the height of the can may be covered / wrapped or otherwise confined from the outside contingent on #3.
3. The diameter of the modified cannot exceed 5% of the original diameter of the can.
4. No scaffolding or internal reinforcement can be placed within the can (including that bonded to the can’s internal walls) in excess of 70% of the height measured from the center of the can top to the center of the can bottom
5. The total weight of the can should not exceed 212 grams.
6. No liquid or compressed gas of any kind will be permitted in the can. Rods or other solid additions to the can, if used, cannot exceed a total cross-section of more than 15% of the can itself. Hollow rods will be considered as solid for purposes of this calculation.

Answer 1

If you have done some experiments to watch how a can buckles as a load is applied, it will give you a good idea as to where the application of reinforcement will give the most benefit.

Answer 2

with the geometry of the can... you would know that the circumference would have all axial load when loaded... for this reinforce the circumference with either circular or spiral in geometry... this reinforcement geometry will be the most efficient as the whole perimeter of the can isl en-caged; the circular-cage-form reinforcement will add more axial capacity to carry the load you'll apply..

Answer 3

Bond kevlar or some stong plastic material to the outside.

Answer 4

Dip the can in wax or liquid latex, then freeze it, it should survive one good shock that way.