There are 20 slots to put full decks of cards. 8 slots can hold magic the gathering sized cardsleaves and 4 can hold the same but with a very tight fit, so i recommend using the yugioh sized sleeves there. but now when i got to my local tournament my nickname of suitcase it going to be solidified because of this. but i used hot glue to glue all the foam in place and i used little beds of it on each one its sturdy unless you man handle it like a goriila. looking at the design i should put thin strips along the side to kee the cards away from the edges. but that's some thing i can figure out over time. i would love comments on what people think... oh and each place can hold around 60-70 sleaved cards so thats around 1200-1400 cards it can hold.