Yes, I do mean those. They're great but the epic cards are very awkward. I found these decently priced binders on amazon that are made specifically for these cards though.

https://www.amazon.com/Forged-Dice-Curiosities-Spellcard-Organizer/dp/B07Y2DPR9T/ref=mp_s_a_1_5?keywords=forged+dice+co+binder&qid=1583885349&sprefix=forged+dice+co+binder&sr=8-5

Unfortunately they're sold out of the 2 pocket 3.5x5 sleeves but the binder comes with some of them and hopefully they'll make more.