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The spell Shrink Item (http://www.d20pfsrd.com/magic/all-spells/s/shrink-item) lets you shrink down objects up to 2 cubic feet/caster level to 1/16 their size, and potentially also lets you change them to cloth.
Range touch
Target one touched object of up to 2 cu. ft./level
Duration 1 day/level; see text
Saving Throw Will negates (object); Spell Resistance yes (object)
DESCRIPTION
You are able to shrink one non-magical item (if it is within the size limit) to 1/16 of its normal size in each dimension (to about 1/4,000 the original volume and mass). This change effectively reduces the object's size by four categories. Optionally, you can also change its now shrunken composition to a cloth-like one. Objects changed by a shrink item spell can be returned to normal composition and size merely by tossing them onto any solid surface or by a word of command from the original caster. Even a burning fire and its fuel can be shrunk by this spell. Restoring the shrunken object to its normal size and composition ends the spell.
Shrink item can be made permanent with a permanency spell, in which case the affected object can be shrunk and expanded an indefinite number of times, but only by the original caster.
Now, suppose I have my 9th-level wizard, over the course of a few days, shrinks a bunch of 2.6 ft boulders down to a bunch of 2 inch pebbles and puts them in a bag of holding. Suppose he's traveling and devotes half his 3rd, 4th, and 5th level spell slots to this cause - say, 6 spells a day for a week = 42 rocks.
The next day, he gets in combat. He decides to fly up and empty his bag of holding onto the enemies, thus dropping 42 2.5ftx2.5ftx2.5ft boulders on the enemy(ies). What happens?
Methinks this ruins any idea of long-duration storage. Once that Shrink Item wears off (if the weight/size goes over the limit for the Bag), then everything in it is gone. Regular, 1sp sack. 1/2 lb, fyi.
Being the example is Next Day, they HAVN'T switched back yet, and they turn into boulders once they touch a solid surface. I'm not one for physics, but the potential energy of a high-mass object falling vs a low-mass object falling would create a different impacting force (correct me if I'm wrong). The pebbles don't gain their mass until contact is made . . . so maybe it becomes force of impacting pebble + "stationary weight of boulder"?
Is anyone a physicist with a specialty in magic and transmogrification?
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Ah, yes - that's why I made sure not to keep them in there longer than the spell duration (1 day/level).
Actually, they transform back "by tossing them onto any solid surface OR by a word of command from the original caster." So, you can empty the bag, have the cloths start to flutter down, and then yell your favorite keyword. (Some good choices: "Avalanche!" "Look out below!" or my personal favorite, "The sky is falling! The sky is falling!") At which point it becomes a simple matter of turning gravitational potential energy into kinetic energy into deformation of various squishy mortals.
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Must. Resist. Must... Resist... Musssst....
"Rocks fall! Everyone dies!"
Must. Resist. Must... Resist... Musssst....
"Rocks fall! Everyone dies!"
This MUST be the command word! XD
Eh, treat it as a trap, a mix between the falling block trap(CR 5) and the crushing stone trap(CR 15). +15 to hit, covers 9 squares (based on the size and number of stones), deals 10d6 damage on a hit.
If you want, you can change the attack roll to a Ref half, which I think, using the same trap rules, you could set at a DC 20 Ref for half damage.
link
I chose 10d6 because the damage on the other traps listed are (CR+1)d6, and I, as a DM, would scale the damage based on the level of the wizard. It's arbitrary, I know, but would be the easiest way to balance it.
Edit: And that definitely should be the command word.