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.
Top Loader vs. Card Saver: Battle of the Protectors
Card Saver vs. Top Loader Key Differences for Trading 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, Football and other Sports Cards(Black)
Toploader storage question - Blowout Cards Forums
Do Top Loaders Keep Cards Safe? An Analysis of Card Protection Methods – Fan Arch
Do Top Loaders Bend Cards? - IndoorGameBunker
Could storing cards in toploaders and placing them side by side stacked in a frame damage them in any way? : r/PokemonTCG
Are Card Sleeves Recyclable? (Ultra-Pro, Top Loaders, Plastic) - IndoorGameBunker
I read Top Loaders can damage cards over time. Which casing method is best if I want to keep my collection similar to this? : r/pkmntcgcollections
Toploader Binder, Holds 288 Toploaders, 9 Pocket Top Loader Binders with Sleeves for 3 x 4 Rigid Card Holders, Yugioh Cards Binder, Sports Cards Binder, TCG Binder Card(Pink) : Toys
Ultra Pro 3 X 4 Clear Regular Toploader 25ct Top Loaders for Cards Baseball Card Protectors Hard Plastic Sleeves : Toys & Games
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)
TIPS: These Toploader binder sheets are much larger than the regular-size card pages, please measure the size of your card binder before purchasing.
Toploader Binder Pages for Trading & Sports Card Toploader Storage, 9 Pocket Double-Sided Toploader Binder Sheets for TCG Toploaders, 252 Pockets