Level: 3
Range: Touch
Duration: 6 hrs + 2 hrs/level
Components: V, S, M
Casting Time: 1 round
Saving Throw: None
Area of Effect: 1 sack

This spell will provide
greater protection for the contents of one normal sack or
backpack. An affected sack is protected as if the interior
were completely lined with inch-thick solid steel, although
the sack becomes no heavier or less flexible. The sack
makes its saves against physical or magical damage
as if made of hard metal, with an additional +2 bonus
applied to the saving throw. Items within the sack must
check only if the sack fails its check. 

MC: A strip of leather with mail sewn on one side.