Attic storage is HOT HOT HOT in the summer & COLD COLD COLD in the winter. They also have silverfish, spiders, other insects. If you value what you are storing NEVER place it in an attic. Wood will split, crack and fade, Luggage does the same. If you love it use it or get rid of it so someone else can love it, but storing things in an attic is "stuff abuse".
My parents stored lots of things in their attic. Things they "saved" for me. Things that had bleonged to ansestors. My Sis and I cleaned out the attic a few years ago and Nothing was in good shape. Mom spent hundred of hrs. on a doll house, but years in an Attic had faded it and dried out the wood and glue. i was all but ruined. It was a shame. I say all this just to warn you, not bash. I learned the hard way how to store things.
Textiles, papper leather and just about everything else except metal and glass should be stored where the temp/ himidity is more or less regulated.
Quilts stored in plastic will get molded and stain. There are special boxes (like for a wedding dress) that would be better for quilts. I am thinking this is a good/heirloom quilt? Quilts like to be used. They also don't do well just hung over a rail and never moved. The quilt can be permantly creases by doing that.
A Restorationist should be able to give more ideas on how to pack it so there are no creases and protection form silverfish and other bugs.
I want to do this right so I don't ruin the twin quilt my mother made for my son when he was tiny. Thanks for any tips or advice. 
