Contrary to popular belief, toploaders do not damage cards. They are actually some of the best protection that you can get for trading cardsassuming that you use them properly.
Do Top Loaders Keep Cards Safe? An Analysis of Card Protection Methods – Fan Arch
Are Magnetic Card Holders Good? (One-Touch, BCW) - IndoorGameBunker
A Top To Bottom Guide on Toploaders
Could storing cards in toploaders and placing them side by side stacked in a frame damage them in any way? : r/PokemonTCG
Toploader Binder - 35pt-55pt 3x4 Gold Portable Top Loader Card Storage, 9 Pocket Card Binder, 216 Slots Rigid Card Holder, 4 PSA Slab Pocket, Lorcana, Pokémon, MTG, Baseball Card Binder
Toploader storage question - Blowout Cards Forums
Material and Protection: Crafted with soft fabric for a better grip and a reinforced hardcover for added security, our binder keeps your cards
KUOOKING Toploader Binder - Holds 288+ Top Loaders for Cards, 9 Pocket Top Loader Binders with Sleeves for 3 x 4 Rigid Card Holders for Baseball
Are Top Loaders Bad or Harmful for Cards? - IndoorGameBunker
How to Store Top Loader Cards - IndoorGameBunker
Do Bent Cards Affect Grading? - IndoorGameBunker
Top Loader vs. Card Saver: Battle of the Protectors
A Top To Bottom Guide on Toploaders
Toploader storage question - Blowout Cards Forums
KUOOKING Toploader Binder - Holds 288+ Top Loaders for Cards, 9 Pocket Top Loader Binders with Sleeves for 3 x 4 Rigid Card Holders for Baseball, Football and other Sports Cards(Black)