[trebleshot]

I would also recommend layers of bubble wrap between each layer of toys, especially in the larger totes. This is especially helpful for protecting toys that have fragile parts. The wrap can also help keep the baggies from sliding and shifting around too much and also help with weight issues.

Which brings up another point: try to distribute the weight evenly when using any container. Put the heavier objects on or near the bottom and the lighter stuff on top. Also, don't overload the containers. Gravity over time can be just as much of a danger as direct sunlight or mold/mildew.

Of course, if you're only going to store them for a couple of weeks, you may be fine with a few simple precautions. But if it's going to be months or years of storage, it's better to be safe than sorry.