I keep a fair bit in plastic bins and ziplock bags the rest is on open shelving. I wash (but don't iron) everything before it goes in the "stash". Some of my fabric is vintage, some I bought about 20 yrs ago and the rest is pretty new. The only problem I have is dust (on the open shelving bit). We have a hot, dry summers (and live in the hills with lots of red gravel/dust) and cold, wet winters. So far I haven't had any problems, but I am a regular rummager and every quarter I take everything out for a shake, refold and scrutiny (along the lines of "Gee I forgot I had that" or "what was I thinking".).