Debra, the glassine envelopes are the kind that stamp collectors use to put valuable stamps into so that moisture doesn't get in and ruin the glue on the back. I think it was Mick Morry over on mydaylilies.com that said he uses them and has never lost a seed to mold.
I get the 1 3/4" x 2 3/4" open end ones from here in larger quantities
https://www.herbariumsupply.co...
or here for smaller quantities
http://www.dianeseeds.com/glas...
It is a lot more expensive to use these rather than the plastic baggies but if it saves an important cross then I feel it's worth it. If they are for your personal use you can be reused them over and over. Just use masking tape on the front to write the cross on and put a small piece over the flap to close it. Masking tape is a whole lot easier to remove than scotch tape. You can either remove the label the following season or just put another piece over the old.
Do you use pieces of paper towel in the plastic baggies when you store your seeds? Most people do this and it helps to control moisture. Also, if your crisper drawers have a moisture control on them try adjusting it to less moisture. I also turn the dial on my fridge to the colder side a little more than normal to be safe.
I started using these because I was so worried, after reading other peoples comments on other sites and such, that with the plastic baggies I would end up with mold and then if I had already sold the seeds I would have to give a refund if I didn't have replacement seeds.
