ive never used cold when dry sifting. (cept the low humidity naturally in the winter) i was wondering tho with ice packs would this not create immediate water in the area via condensation and evaporation thus upping the humidity?
i think maybe an EXTREMELY strong desiccant(thats safe) in the box with herb left in there may work good with or without ice? what do you think bubbleman on a desiccant inside a tumbler? the box would obviously have to have an air tight seal as well for this desiccant to even work