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It depends on how long you mean by "long term", and what the prevalent conditions are.Much like any other living thing, mold requires food, moisture, a comfortable environment, and oxygen to grow. Unfortunately some of the components in vinyl are tasty to mold, so the best way of controlling it is by preventing access to sufficient water. Warm temperatures will make it grow faster, cool temperatures slow it down. Relative humidity over 60% can cause mold growth - if you stay at ~50% or below, you should be safe. 50% is considered the ideal magic number for mixed material collection conservation.Plastic bags present two hazards - they create a micro-environment, and may contain unstable chemicals themselves, such as plasticizers. If your pony is mold free and being stored in an environment that is not friendly to mold already, encapsulating them in plastic shouldn't be too problematical for short term storage. If the pony already has the beginning of mold, or is coming from a humid environment, putting them in plastic bags is a bad idea.The greater unknown is what chemicals are in the plastic bag itself, and how they will interact with the item stored inside. All plastics, bar none, are considered "unstable materials" from a conservationist's point of view. Generally the more flexible the plastic, the more volatile plasticizers are in it, though there are exceptions such as mylar. Every plastic is unique, which makes predicting the interactions extremely difficult. Because of this, I do not recommend any long term, airtight storage for plastic collections.Good reading on mold growth: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1056928/pdf/applmicro00290-0019.pdfPlastics degradation: http://si-pddr.si.edu/dspace/bitstream/10088/11186/1/mci_WAAC2010-Tsang.pdf
As an alternative to plastic-based storage methods, perhaps you could wrap each pony in plain acid-free tissue paper and pack them in cardboard boxes - throwing in a few of those silica gel sachets to absorb any moisture may help tooIf you are able to store them in a cool dark place, that will help too, but not somewhere that is damp!Jem