Ditto on the totes and moisture absorbent. They make it in little plastic buckets with holes in the lid too. I keep one in my old Ford truck. It would help prevent condensation forming during severe temperature shifts which would wreck your decals and moisten the chipboard boxes that most kits are packaged in. If mold forms on your boxes in a dark container, they're toast.
Also, photograph the contents of a long storage tote and tape the photo on the side of the box to show what's inside. Way easier than popping the top and digging through it.