How can I store the finished cross stitch on linen and fabric Aida?

I have about 10 large cross-stitch pieces that I want to store that I can use the frame / glass images, how can I safely store items cross-? Will put them in a plastic container with paper absorbing free acid from good enough? Thank you!

Ditch the plastic container and use a buffer, such as: http://www.universityproducts.com/cart.php?m=product_list&c=1414&parentId=1266&navTree [] = 1266 & navTree [] = 1311 & navTree [] = 1414 or http://www.universityproducts.com/cart.php?m=product_list&c=1460&parentId=1266&navTree [] = 1266 & navTree [] = 1460 http://www.si.edu/mci/english/learn_more/taking_care/geotex.html http://www.ca.uky.edu/agc/pubs/fcs2/fcs2707 / fcs2707.pdf

Cross Stitching over 2 on Linen – Julie’s Cross Stitch Tips