https://www.amazon.com/gp/product/B01IQD6E98/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

This is my binder of choice to store any expensive cards (or nice artwork cards) and my sleeves of choice are Samurai Shield

https://www.amazon.com/gp/product/B07NRHDF8L/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

All of these come from watching MTG reviewers. As far as I know MTG recommendation on storage and protection is just as applicable towards Pokemon card collecting. These products have been tested/abused or have seen regular use. So I have high faith in these products.