This one is what I use. Its big, and obnoxious, but holds my current decks (14) in jewel cases laying flat, big dice bag, and 4 playmats. The inside has a rubber foam padding and it comes with some dividers (tho the are kinda cheap and will tear up the padding if you arent careful). The lid has a divider that can be removed and if you bend or remove the metal tabs on the lid (ment to keep the lid divider in place) you can fit even more decks if you place them on end.

With my set up i can set up with friends and be able to have a solid multiplayer game without anyone else needing to bring anything

*ninja edit: if you have prime it knocks $20 off the price making it much more worth it