Bags and Boards size?

https://preview.redd.it/f2dywlqg2xjg1.jpg?width=4000&format=pjpg&auto=webp&s=3c65a5378c5535626a7015378fcf991b97cdf7d5

Sorry in advance I have always been an action figure collector, and only dabble in comics here and there. Which bags & boards should I get? I ordered a 50 pack of Silver Age, but these EU Volumes barely fit in, and are really tight. Als once in they are slightly curved.

What should I be using?

https://preview.redd.it/xhyidtjj1xjg1.png?width=993&format=png&auto=webp&s=b3eee8a0e2c7605e94688b3f321380067a96aa06

https://preview.redd.it/furmwthh2xjg1.jpg?width=4000&format=pjpg&auto=webp&s=c9c88ef9b1dd9acdf46f82896d7d50f9a5b12747