
Storing toys...paper or plastic?
It's really a 'cardboard or plastic' question, but I couldn't resist the thread topic.

We recently finished thinning out some things that we didn't need/want. Among that group was a set of Mirage Omnisat speakers that I had used very briefly and put back into the closet. I took great care of them, and the speakers went back into the original boxes with the original foam and factory plastic.
Fast forward a few years (let's say two) and I pull the speakers out to find that the plastic bags have basically melted/merged with the plastic bases of the speakers. The speakers were stored in a climate-controlled environment, no humidity, no smoke, etc.
This got me thinking about how I store my toys. Currently, most of my collection is in storage (a closet). They're in their separate bags in larger boxes. With the exception of a single Marmit figure that experienced some 'vinyl sweating', I haven't had any problems with figures I've stored this way.
Seeing what happened with the speakers, though, got me wondering if they'd be better off in small separate boxes, out of their bags. I realize a cardboard box isn't necessarily an acid-free environment, but I was thinking it might be better than leaving them in their bags.
Thoughts? How do you guys deal with things that need to stay in storage for long periods? Cardboard or plastic?