I recently started my first TCG as an adult and have been going through a lot of cards. It's made of a hard plastic. There are 4 rows with 4 slots at the end that have supplied top loaders to help you organize by displaying cards that show you what's in that row.There are slots for proprietary dividers, of which you only get 4 of. They do sell sets separately. The packed 4 feels like too little, but the 12 divider add on feels almost like too many. I guess we'll see as my collection grows, I'll eventually use all of them.The rows are pretty accommodating. I personally have standard sized cards (Lorcana/Magic/Pokemon for reference). I put the bulk in without sleeves. I do have a couple of the 100+ Eclipse thinner plastic deckboxes, but several brands have similar products, and these fit inside of the rows. This is a nice way to further protect/organize more expensive cards. You can also fit top loaders, which is nice. I cannot fit some of the more larger magnetic deck boxes from gamegenic/ultimate guard.The flaps at the top can fold and wrap around the box and there are studs that can firmly hold them in while its in the open position. The same studs work well with stacking multiple same-sized boxes. I'm not sure if you can stack the half sized bin with this one as effectively. The flaps also have sliding locks to help protect the contents when moving it around.This is a great box, well worth it. I hope this is more than enough for my time collecting cards, but I wouldn't be against getting another one if I ever manage to pack this out.