Hi Antje
I would reccommend using a dry ice mailer. After you place the slides in a
plastic slide holder they can be placed in a styrene foam container w/dry
ice then placed in a corrugated outer shipping box. Depending on how many
samples you'll be sending they come in a variety of sizes. I would be happy
to forward you manufactuers information for them if you would like.

Liz Standish
Government Scientific Source
800-248-8030