Card Saver 1's are your best option for graded card submissions.
They are archival safe and have been made exclusively by Cardboard Gold for over 20 years. This listing is for two (2) 100 count packs. Card Saver 1 Semi-Rigid Trading Card Holders | 1 Pack Box of 200 These are semi-rigid card holders that fit all standard sized trading cards and some over-sized cards.They are the only card holder that is recommended by PSA and BGS by name.