Make yourself some of these little sachets and place 2-3 in every container you use for storage. I've done this for 20 years and do not have musty odors/bugs in my fabric or packed away quilts/tops/projects. I even used to stick them among the fabric stacks in my shop years ago.
You can buy the little muslin tea bags - which are about 1.5 inches x 2.5 inches - or you can make them by the dozens in cheap muslin. It's like tiny a pillowcase but with the top edge folded and sewn to make a small channel thru which you can run some thin cotton string to tie the top edge closed.
I fill mine using a small spoon. The filling consists of the following:
dried lavendar )I buy mine in bulk online)
cedar shavings (Some is available in pet stores for bedding)
a few cloves or dried rosemary if you wish
Massage the little sachets a bit before placing in the containers to release the lavendar scent.
These make cute little gifts, too, when tied to a present with the ribbons.:)
Wish I had a photo of some of mine, alas....... Maybe this will help.
Jan in VA